Google Buzz may be a centralized microblogging system, but for the most part, its not run by humans .. instead; robots. What better way for Google to gain access to real time Twitter data (if Microsoft ever buys Twitter and blocks Google access) than have Google users run auto tweeted material through Buzz? PostRank has an interesting study on the percentage of Buzz that is powered by feeds and bots. Turns out, approximately 60% of the content on Buzz is from Twitter!