Research time: Social Network Discovery

We frequently take up new research topics, but don't always post the subject matter unless we formally write an article. Recently we've been exploring new social networks, as we've been interested to find options beyond Mixx.com, Stumbleupon, Facebook, ComputerLove, Sphinn, Furl, etc. We noticed that many upstart social networks struggle with SPAM which derides the quality of the tool. Currently we are looking at: Folkd, Oyax, Kwoff and the Ausie social network ausculture.com.