FriendBinder is probably one of the most useful websites out there! It could literally solve the problem of having to switch between different social networks to check and update each one.
Friendbinder brings together your friends from different social networks including Twitter, Facebook, Digg, YouTube, Flickr, and more. It lets you keep track of all your friends in one place, saving you time and even lets you post updates. You’re friends don’t even have to be members.