The problem with Facebook and other social media is that they were not designed to carry advertising.
via Advertising Age – Homepage http://adage.com/article/rance-crain/buzz-social-media-users-interested-ads/234842/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+adage%2Fhomepage+%28Advertising+Age+-+Homepage%29