It is quite well known that cyber criminals use ads services as part of the attack vector to lure victims into their malicious activities, however, Linha Defensiva has done a brief research and found that ads shown in Facebook can lead users to pages created for the sole purpose of stealing data, such as credit card numbers and personal details. Could it be that Facebook relies on its advertising terms and policies to reject such malicious attempts without actually validating ads?
Read more here – http://www.linhadefensiva.com/2012/07/criminals-buy-facebook-ads-that-lead-users-to-phishing-pages/