TweetDeck

TweetDeck is an on Adobe Air-based Twitter- client with Facebook- status- integration and the possibility of synchronization. TweetDeck has like the Finder in Mac OS X a free customizable column view. TweetDeck makes it possible to manage multiple accounts (Twitter, Facebook, MySpace, etc.) and to use them parallel.
It is also possible to synchronize the Twitter messages and Facebook status notifications via TweetDeck web account on multiple computers . The synchronization also works with the corresponding iPhone and iPad apps.