新浪

http://code.google.com/p/oauth-dot-net/

http://www.cnblogs.com/mainz/archive/2010/12/01/1893718.html

http://www.cnblogs.com/prolifes/articles/2263033.html

http://www.cnblogs.com/shiningrise/archive/2012/01/01/2309725.html

QQ:

http://qqconnect.codeplex.com/