DDSocialClient is not maintained anymore. It was a fun project to work on at its time but things have changed quite a bit with all the new Social stuff on iOS.
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DDSocialNetworkClient is a handy library that makes access to social networking clients easy!
At the moment, it supports Facebook, Twitter, Flickr and LinkedIn.
I am planning to add support for Last.fm and Foursquare.
The authentication is based on OAuth.
Most of the server communication is done with the *excellent* ASIHTTPRequest library from Ben Copsey!