Official source: FB's SEC Form 10-Q (http://www.sec.gov/Archives/edgar/data/1326801/000119312512325997/d371464d10q.htm#tx371464_14 http://www.sec.gov/Archives/e

Official source: FB's SEC Form 10-Q (http://www.sec.gov/Archives/edgar/data/1326801/000119312512325997/d371464d10q.htm#tx371464_14 http://www.sec.gov/Archives/edgar/data/1326801/0001193125123...) Double or triple that number for reality, plus add a year since that report. Also common sense when you have 10 accounts with 100 users each, all fake :) Edit: It's closer to 12-18% of all accounts (incl. 5-6% duplicate accounts)