http://u.qdnx.org/file/erkan-20150112T132120-uanldv8.html
So, !elgg gets mentioned here (1) but not !gs or !friendica or the others (2)? (1) http://www.honeytechblog.com/top-20-free-open-source-social-networking-software/ (2) http://www.skilledtests.com/wiki/List_of_Federated_Communication_Platforms