I don't think we know. They should be audited. Eventually, when the general ad fraud scandal [1][2] starts to really harm a lot of companies, there will be pres

I don't think we know. They should be audited. Eventually, when the general ad fraud scandal [1][2] starts to really harm a lot of companies, there will be pressure to audit usage metrics more stringently. Supposedly though FB has held itself (and FBX, which is overall a great product, in particular) as 'fraud-free.'[3] Dunno about that, especially since faking likes is trivial. Anyone who knows how to operate a search engine can do it in less than five minutes. [1]http://blogs.wsj.com/cmo/2014/03/23/online-advertisings-crisis/ http://blogs.wsj.com/cmo/2014/03/23/online-advertisings-cris... [2]http://searchenginewatch.com/article/2329878/Facebook-Ad-Fraud-How-Can-Advertisers-Combat-Paid-Likes http://searchenginewatch.com/article/2329878/Facebook-Ad-Fra... [3]http://www.businessweek.com/articles/2013-11-26/how-facebook-beats-ad-fraud http://www.businessweek.com/articles/2013-11-26/how-facebook...