For over a year developers have been asking for an API from Quora, the Q&A site that has recently exploded in popularity. The company had been waiting until there were "enough users and content on Quora." A browser extension outed the interface and now there is an officially released, but still alpha Quora API.
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.