In September ProgrammableWeb organized a track on social APIs at DataWeek. We were pleased to be supported in the effort by 3Scale. We also invited the company's Steven Willmott to share what he has seen within the rapidly-growing space of social APIs.
There are many tools to analyze and rank Twitter users, but a new one takes a trick from Google's book. Trst.me uses an algorithm similar to Google's PageRank to give any Twitter user a score from one to 10 based on their followers' networks of followers.