Trying to share information with people on your Web-based networks can introduce another layer of digital jujitsu. It can be awkward to snag a photo or a snippet of text from one Web site and send it to a friend in a social network on another, or post it to your own blog.

But I’ve been testing a little-known Web browser that attempts to solve these problems. It’s called Flock, and it bills itself as “the social Web browser.” I found that it worked well, but it isn’t for everyone, and it has some important downsides.

Flock is a modified version of the excellent Firefox Web browser that tacks on some special features for social networkers and bloggers. It’s available free at flock.com in essentially identical versions for Windows, Mac and Linux.

Flock adds a special vertical “sidebar” at the left of the browser that keeps your social networks, photo sites or news feeds visible at all times, regardless of what page you’re viewing in the main browser window.

For instance, with Flock, you can see that you have a new friend request in Facebook, or that a pal has posted new photos in Flickr, without clicking away from reading this column in the main browser window.

But, wait: There’s more. With one click, you can display a horizontal “media bar” across the top of the browser containing thumbnails of all of a friend’s photos or videos from a social-networking or photo site, again without changing what’s in the main browser window.

These two special bars also allow you to take action. For instance, you can just drag images and text from Web pages into the sidebar to share them with friends listed there. And any photo on the media bar can be quickly emailed or posted to a blog.

There’s also a “Web clipboard,” which can save any text, image or link from a site in the main window by merely dragging it to the Flock sidebar. Once an item is in this clipboard, it stays there until you delete it.

Flock has its own built-in blog editor, which allows you to quickly compose, edit and publish blog posts containing interesting items you encounter on the Web. And it creates a special personal Web page, called My World, which combines your social-networking updates, news feeds and photos.

I found Flock productive and fun to use. I tested its special sidebar with my Facebook, Flickr, Picasa and YouTube accounts, and with my favorite news feeds. I also used another of Flock’s features, which let me check my Gmail and Yahoo Web-mail accounts without navigating to their main pages. And I published several posts from within Flock to a test blog I maintain. All of this worked as promised.

In my tests, I used the latest edition of Flock, version 2.0, which is built on the new Firefox 3.0 browser. Even though this latest iteration of Flock is still in beta status, I found it to be quite stable.

But Flock isn’t for everyone, and it has some significant drawbacks. For one thing, you’d need a fairly large or high-resolution monitor to accommodate the Flock sidebar and media bar without reducing the size of the main browser window so much as to require too much scrolling. Even with a big or high-res screen, you will see fewer toolbar links and browser tabs than normally.

And, Flock has a busy, even frenetic, look that can be distracting and annoying. So many things are going on at once that it can be hard to concentrate on the main attraction: the Web page you are reading in the main window.

Also, while Flock does indeed spare you from clicking back and forth as often among tabs in your browser, it doesn’t entirely eliminate clicking around. Its sidebar can display only one type of information at a time — social networks and photo-sharing sites in one view, news feeds in a second, the clipboard in a third, and Web bookmarks in a fourth. So you’ll have to click the sidebar’s own controls fairly often to check all of these, or keep going to the special My World page in the main window.

Finally, Flock works with only certain social networking, photo-sharing and blogging services. While it does support most of the main ones, there are some glaring omissions. MySpace isn’t yet on the list, though it’s expected to be added next month. But Hotmail, Windows Live Spaces and SmugMug, among others, are missing. And it doesn’t support any instant-messaging services at all.

Flock does a good job at the tasks it sets for itself, but I would recommend it for only the heaviest and most impatient social networkers. For most others, Flock is overkill.

Find all of Walt Mossberg’s columns and videos online, free, at the All Things Digital Web site, walt.allthingsd.com. Email him at mossberg@wsj.com.

This is especially true if you are the kind of person who saves most of his or her email. That mound of messages can be a treasure trove of contact information and a history of your interactions with hundreds, or thousands, of personal and business acquaintances. It can tell you the phone numbers and job titles of people, and even who you and your correspondents most often copy on email. It’s a sort of social network all its own.

The trouble is, it’s hard to tease all that information out of the typical email program. And that goes double for the most popular, but most bloated and dense, email program of all, Microsoft Outlook (MSFT).

Now, however, there’s a new, free plug-in module for Outlook that adds a set of social-networking and data-mining features right inside the venerable program. This new plug-in for Outlook is called Xobni, which is “inbox” spelled backward and is pronounced “ZOB-nee.” It is completely contained in a colorful vertical panel that lives on the right side of your Outlook screen and doesn’t block or intrude upon Outlook’s own panes or functions.

I’ve been testing Xobni and I like it. The product has some flaws, and is still a work in progress, but I found that it made Outlook much faster and more useful. Xobni turned my Outlook experience from one that was organized by messages and dates into one that was organized by people, relationships and histories.

Xobni, available at Xobni.com, works with the 2003 and 2007 versions of Outlook, whether you are running Windows XP or Windows Vista. The San Francisco start-up behind Xobni, also called Xobni, is working on versions for other email readers, such as Yahoo Mail (YHOO).

Xobni indexes all your stored email, starting with the most recent messages. Once the email is indexed, the Xobni sidebar shows a profile of the sender of any email you have selected in the message list in your inbox or other folders. Each profile is divided into useful sections, and as you drill down into the specifics on each person, the entire sidebar may fill with more detailed information.

At the top of the Xobni panel is a huge search box. This in itself makes it worth installing the program. It is much faster and better than Outlook’s own search, returning results almost instantly and in two lists — people and mail — with the search terms highlighted.

But that’s just the start. Under the search box is the name of the sender of any email you have selected, with a photo, if available, and a bar chart showing how many emails you’ve received from that person and the times of day when that person appears to be most or least active on email. The latter can be a handy guide to deciding the best time to send an email for a quick response.

Under that is a section carrying the person’s phone number, extracted either from Outlook’s contacts or from the person’s email signature or the body of his or her emails. If Xobni can’t find a phone number, you can click on a link that appears where the phone number would have been, to generate an email asking for a number.

Similarly, Xobni can generate an email asking for a meeting with any person in its profile and fill in that email with your open times for the next few days, drawn from your Outlook calendar. You can also open a new, blank email form, preaddressed to the person in the profile, with a single click.

If the person has a profile on the business-oriented LinkedIn social-networking service, the Xobni panel will display his or her job title, employer, and a photo from LinkedIn.

The final three sections in the Xobni sidebar are even more useful. The first one shows the person’s email “network” — a list of everyone that person has placed in the “To” or “Cc” fields of emails you’ve exchanged. The next section is called “Conversations” and displays the entire threads of all the email exchanges you’ve had with the profiled person. Finally, there’s a section listing all the files you have exchanged as attachments with the profiled person.

Each of these sections has its own search, and allows you to open the entries it contains.

There are some bugs. In my tests, Xobni mistakenly merged the profiles of a few people. It also failed to recognize that the emails bearing different versions of a person’s name — like “Thomas” and “Tommy” — but with the same email address, were the same person and should have a single profile. Xobni also can cause glitches during manual syncing of BlackBerrys and other devices. The company says it is working on fixing those bugs.

But, overall, Xobni is a smart addition to Outlook that makes email much more useful.

• Find all of Walt Mossberg’s columns and videos online, free, at the new All Things Digital Web site, http://walt.allthingsd.com. Email him at mossberg@wsj.com.

Starting Thursday, however, there will be a new online service that aims to change all that. The service, called SnagFilms, allows anyone with a blog, a Web site, or even a page on a social-networking site, to open a virtual movie theater and show these documentaries, free. The virtual theater is a small widget that contains the film, and that can be embedded easily and quickly in a wide variety of popular social-networking services and blog platforms. No technical knowledge is needed.

Once a site or page owner “snags” a film in this way, visitors to the site can view it in a larger window that pops out from the widget. This window plays the film, displays some ads and provides links to charities or organizations related to the topic of the movie. The films can even be played in full-screen mode. Many also include links for buying a DVD of the film. All that’s missing is the popcorn.

These aren’t homemade, three-minute YouTube (GOOG) clips. Nearly all are feature-length, professionally produced documentaries, from both small independent filmmakers and well-known sources such as PBS and National Geographic.

The owner of the site or blog gets no direct revenue from posting the films. He or she is, in effect, donating space to support the film or the cause it highlights, a decision SnagFilms calls “filmanthropy.” But the filmmaker and SnagFilms do make money — splitting advertising revenue equally. And the charity or organization can make money, too, if viewers opt to donate. The filmmaker also can make money from DVD sales, paying SnagFilms an 8.5% commission.

I have been testing a prerelease version of the SnagFilms service and have posted SnagFilms widgets with no problems to Facebook, MySpace (News Corp), iGoogle, Netvibes, Blogger, Windows Live Spaces (MSFT) and Vox. Many more Web sites can house these widgets, including the vast number of blogs built on the popular WordPress and TypePad platforms.

Here’s how it works. You just go to the SnagFilms Web site at www.snagfilms.com, select one or more of the 250 or so films available at launch and click the snag button. A menu pops up that lists numerous popular networking services and platforms. Clicking one will automatically post the SnagFilms widget of your choice on your page or site at one of these services. You can also simply view the films at the SnagFilms site.

Each widget includes an “info” button that takes you to a page on the SnagFilms site giving the details and background on the film. You can also leave comments here, rate the film, order the DVD and see recommendations for related films.

The system is viral, so you don’t have to start at the SnagFilms site. A Web surfer who sees a SnagFilms movie anywhere on the Web can spread it around just by clicking the snag button on every widget. The snag button allows the viewer to either host the film or to email a link to the film that will bring friends to the SnagFilms site to view or snag it.

SnagFilms is the brainchild of Ted Leonsis, a former top executive at America Online (TWS), who in recent years has become a documentary-film producer. He became frustrated with the distribution bottleneck for such films and arranged to take over AOL’s documentary site, TrueStories, and turn it into SnagFilms. He also is chairman of the board of a company, Clearspring, which created the film widgets.

At launch, the SnagFilms catalog includes well-known documentaries like “Super Size Me,” but also lesser-known films on a wide variety of topics, including college football, AIDS in Africa, politics, profiles of average people and tales of the New York Fire Department. One of my favorites was “Paper Clips,” the story of how a school in Tennessee learned about the Holocaust.

Filmmakers can submit movies to the site by sending an email to: submissions@snagfilms.com. SnagFilms says it doesn’t censor or edit the films, but won’t accept pornography or films deemed to encourage hate. It does have a selection process, so not all films submitted will make it onto the site. The company hopes to add more films soon.

I had only two gripes about SnagFilms. First, the films should be able to play inside the widget itself, with an option inside to play at larger sizes. Having to open a separate browser window is a pain. The company says it’s working on this.

Second, the initial catalog is light on documentaries from a conservative or probusiness perspective. But the company says it is “actively seeking to offer differing viewpoints” and will soon add “a number of films that are quite conservative in philosophy.”

SnagFilms is a great idea for getting documentary films in front of more people. It’s another example of how the Web is changing media distribution for the better.

• Find all of Walt Mossberg’s columns and videos online, free, at the All Things Digital Web site, walt.allthingsd.com. Email him at mossberg@wsj.com.

So, last month, the photo giant introduced Photoshop Express, its free Web-based service for storing, sharing and editing photos, in an effort to compete with established online photo services such as Yahoo’s (YHOO) Flickr, Google’s (GOOG) Picasa Web Albums, or the photo-laden Facebook social-networking service.

Photoshop Express has many of the same features as Flickr and its ilk. It gives you two free gigabytes of photo storage. But Adobe is hoping to make its mark with editing.

Most online photo services offer little or no editing, assuming you’ll do that using software on your computer before you upload your pictures. But Photoshop Express, borrowing from Adobe’s deep knowledge of photo editing, offers the nicest set of Web-based editing tools I have seen. They are sophisticated for a consumer application, yet easy to use. They edge out those in Picnik, a pioneering Web-based photo editor I hailed last year.

These slick editing tools are not only available for use with photos you’ve uploaded from your hard disk. You can also use them to edit pictures stored in your accounts at Facebook, Picasa Web Albums and another big photo-storage service, Photobucket — all without leaving Photoshop Express. You can even move pictures between Photoshop Express and these three services just by dragging and dropping.

Adobe’s new service is available in the U.S. only, at www.photoshop.com/express.

I’ve been testing Photoshop Express and its service overall is pretty good, even though it’s still labeled “beta.” It’s a nice example of the Web 2.0 trend, where programs accessed via a browser can look and feel like applications that live on your computer.

But Photoshop Express is rough around the edges. It can be slow at times, and it’s missing some obvious features, like the ability to easily download publicly shared pictures from other members or to print photos. Adobe says it is working on these things.

Photoshop Express isn’t meant to replicate all the features and power of Photoshop. It’s more like a Web-based version of Photoshop Elements, Adobe’s consumer software package.

I tested Photoshop Express on multiple computers: PCs running Microsoft’s (MSFT) Windows XP and Windows Vista, and Macs running Apple’s (AAPL) Leopard operating system. I used it in all three major Web browsers: Internet Explorer for Windows, Firefox on both Windows and Mac, and Safari, also on both platforms. It worked fine in all of these operating systems and browsers, though it does require Adobe’s free Flash software.

For my tests, I uploaded from my computers dozens of photos, from very large images captured with good digital cameras to smaller shots from cellphones. All were handled perfectly by Photoshop Express. I also opened and edited pictures in Photoshop Express from my accounts on Picasa Web Albums and Facebook. All of this worked well, though uploads of large images can be slow if your Web connection is pokey.

Photoshop Express is a handsome product, presenting your photos on a gray background with controls and features arrayed at the top and bottom, and down the sides, in a logical, clear manner. Your own photos are presented in a section called “My Photos,” and can be organized into albums. Photos that other Photoshop Express users have chosen to publicly share are organized into collections called “Galleries,” which can include multiple albums. You access these community photos by simply clicking on “Browse” or performing a search.

For each album you create, you can choose to share it publicly or to keep it private. Whichever option you choose, you can email friends either a link for viewing the album or a single photo. Your own photos can be downloaded at a variety of resolutions, including original size.

When you view shared galleries or albums, they appear as slide shows. You can select a number of slick effects by which the slides appear, allowing them to zoom and glide into place from various directions.

The editing features really stand out. In addition to standard tools such as auto-correction and red-eye elimination, Photoshop Express lets you touch up areas; adjust exposure, saturation, and lighting; and even make certain colors pop — so grass is greener, for instance. And, in most cases, it shows you small example images illustrating the changes, then previews those changes in the larger main image just by moving your mouse over the example. You can revert to your original at any time.

Unfortunately, there are a number of problems. Photos, especially large ones, can take awhile to appear in the editing module and to snap into focus. Captions sometimes get lost or mixed up when you move photos to other services. You can view shared albums only as slide shows, not as individual photos.

Still, Adobe has made a good start with Photoshop Express, and it’s worth a try if you want better online editing for your pictures.

Email me at mossberg@wsj.com. Find all my columns and videos online, free, at the new All Things Digital Web site, http://walt.allthingsd.com.