Despite a class-action settlement in August that was supposed to ensure that Facebook users clearly consent to their comments, images and “likes” being used in ads, it has been business as usual on the service. If you are among Facebook’s 1.2 billion users, the company says, you are automatically consenting to such social ads. Opting out is impossible for some ads, and for others, the control to stop them is buried deep within the service’s privacy settings.

They're being sued for failing to require Facebook to receive explicit permission from parents before using the personal information of teenage users in advertising.

src: http://www.nytimes.com/2014/02/13/technology/facebook-deal-on-privacy-is-under-attack.html