According to Facebook's community standards page, there are nine types of content that may be deemed offensive and removed. Those categories include :  Violence and Threats, Self-Harm, Bullying and Harassment, Hate Speech, Graphic Violence, Nudity and Pornography, Identity and Privacy, Intellectual Property and Phishing and Spam. 

The photo above along with 11 others were the most talked-about Facebook bans of 2012.  See all 12 in this link at oddee.com