There was once a stunning IM-client for Windows-based platform Trillian, who was a multi-protocol support and a rare Then the function - meta, when one user in your contact list has ICQ, GTalk, etc. presented as one.
Today, after years of development, Trillian releases freeware beta available for download.
Existing protocols added support for social networks facebook, twitter and foursquare with Chekina :)
Thank God, and to Trillian team realized that by writing interfaces - not correct and should remain in the guidelines, which exist in Windows 7 for developers. Because the client interface became "slimmer" and cleaner. It appeared in the window header blue button of global governance, in Firefox 4.
Another interesting feature Trillian was the adaptation of the window size to the work mode or messenger client social networks. with Brush button in the header makes the main window is narrower or wider in a couple of clicks.
Trillian 5 beta for Windows
Trillian 5 alpha for Mac