Like TweetDeck, Seesmic seems to be designed with Twitter primarily in mind, with Facebook being a "wouldn't it be nice" type of add-on. But Seesmic has been more ambitious with its use of Facebook Connect, a technology that allows third-party applications to exchange and access information with the huge social network.
On TweetDeck, you merely receive status updates from your Friends on Facebook, and you can update your status as well. Seesmic allows this, plus lets you view other pieces of rich content on Facebook (pictures, shared articles) that appear in your News Feed. This gives the app tremendous upside, especially if you have friends who frequently update Facebook but don't even bother joining Twitter.
Seesmic has exceeded my expectations. When I first installed it, I viewed it as a copycat of TweetDeck. But after spending some time with it, I came to like the experience and the design. I like interfaces that are lighter in color, and, at times, I find the TweetDeck interface too dark and depressing. As someone who uses Facebook almost as frequently as Twitter, the integration point with that social network is useful. Seesmic is not immediately easy to use, however. As I mentioned, adding users to a group is a pain, and that function is often why people turn to these types of apps in the first place.
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