So, the CIA, in 1999, set up an investment arm called In-Q-Tel that sort of makes investments in technologies that the spy agencies would like to see grow. And their latest investment is in this company called Visible, which basically takes blog posts and takes Twitter updates and takes comments on YouTube videos and sort of sorts them out and decides which people have the most weight in the blogosphere, which people are the most influential, and also filters out, you know, certain key words, decides whether certain posts are hostile or positive. And it’s basically a way for them to sort of keep track on what’s going on in Twitter, on the blogs, etc. Full article.