Top ten most followed accounts on Google+, Twitter and Facebook (click on it to enlarge):
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Google+ Statistics currently tracks and generates detailed statistics for 40,078 users and pulls in hundreds of the most popular posts, every second of the day, from Google+. Add yourself (see sidebar) so we can start tracking your personal Google+ statistics too. You will be able to see how many people added you to their circles, how you grow over time and where you rank in the list of popular Google+ users.
http://socialstatistics.com
http://twitaholic.com/
http://www.facebook.com/pages/Top-100-Most-Popular-Fac%E1%BA%BBbook-Pages-In-The-World-2011/165408200173753
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