ffOldAvatars takes you back and shows previous profile pictures of your FriendFeed account.
A unified social tool that simplifies social login and single sign-on implementation. With the tool, you can allow users to log into your website using Facebook, Twitter, Google, Amazon, LinkedIn, and 25 more ID providers. You can also get accurate social profile data and social analytics.
|Twitter, LinkedIn, GoogleSSO, Facebook|
Twibitz analyzes a Twitter user based on their profile and history to give you a snapshot of their "tweet style".
|Twitter, PeerIndex, Klout|