Fusion 0.0.3 has been release, Fusion 0.0.3 works with iOS 5 or higher.
Fusion, a new tweak currently available in Cydia, adds Twitter like iOS 5 integration to social networks like Facebook, Foursquare and MySpace. This is a pretty cool tweak, if I must say, as it lets you quickly update your status, location and more directly from the Twitter sheet. The social networks included are plugins, thus other developers can create new plugins for new social networks, if more are coming. It also has quick composing, which means that it will not launch Facebook or Foursquare apps when updating status.