Usability 
FriendBinder is a new service that which went public with its Beta earlier this month. It seems to be generating quite a bit of buzz. FriendBinder aggregates updates from your Twitter, Facebook, Flickr, YouTube, Last.fm and Delicious.com friends into a single stream allowing you to keep track of all your social networks in one place. You can view all your friends or filter the feed to show only updates the ones you are most interested in or only updates from a particular network
You can Tweet, ReTweet and Reply on Twitter and update your Facebook status from within FriendBinder.
Mobile access is provided and is fairly full-featured. It shows your FriendBinder streams and includes the ability to post updates to Twitter and Facebook.
Administrative functions are somewhat limited in the mobile version. It's not possible to register for a FriendBinder account or add new networks using the mobile interface. You must go to the desktop site at friendbinder.com to register and perform most other account maintance functions. Source Oh! Mobile Directory