Also, two major models of social graphs (Lead/Follow/Mutual and Enforced Mutual): http://blog.rmdstudio.com/2009/01/19/social-graphing-models-used-in-the-socia

Also, two major models of social graphs (Lead/Follow/Mutual and Enforced Mutual): http://blog.rmdstudio.com/2009/01/19/social-graphing-models-used-in-the-social-networks/ http://blog.rmdstudio.com/2009/01/19/social-graphing-models-...