http://www.developer.com/lang/rubyrails/article.php/3908996/Top-5-Rails-Frameworks-for-Building-Social-Networks.htm
If you are a Rails developer and you want to build a social network, you're in luck. A number of Rails frameworks are available and they all promise to allow you to implement social networking features easily, effectively and productively. In his JavaBoutique article The Top 5 Social Networking Frameworks Built on Rails, Saurabh Bhatia examines five of the best, most comprehensive social network frameworks built on Rails: Most of these social network frameworks have similar features, but Saurabh explains how they differ as well.
Top 5 Rails Frameworks for Building Social Networks
October 19, 2010
Read the full story at JavaBoutique:
The Top 5 Social Networking Frameworks Built on Rails