MOZAT is probably the most powerful mobile social tool on this planet! It connects you with your friends no matter what phones they use.
Features: Facebook, Twitter, Windows Live Messenger, Yahoo! Messenger, GTalk, Facebook chat, File transfer, Delivery status report, Social games (Ocean Age, Texas Hold'em, and more)
Mobile twitter client site with the following features: Directs, Replies, Favourites, User search, Search. Besides these core functions, Slandr integrates Geo-services: Maps your friends, Twitterlocal integration
Snaptu Facebook application lets you and your friends share via Facebook the highs and lows of everyday life on the go. Just seen Brad Pitt crossing the road, reach for your mobile and tell the world on Facebook! Give live status updates, browse through your friends profiles, read and write messages