http://www.bbc.co.uk/news/technology-24608499

> Facebook is allowing videos showing people being decapitated to be posted and shared on its site once again.

> The social network had introduced a temporary ban in May following complaints that the clips could cause long-term psychological damage.

[...]

> Its terms and conditions now state that it will remove photos or videos that "glorify violence" in addition to other banned material, including a woman's "fully exposed breast".

So,(in 2013) they allow beheading videos so long as you're not glorifying violence.

http://www.cnet.com/uk/news/facebook-actually-sorry-for-bann...

And in 2013 breastfeeding mothers were banned from Facebook.

The breast feeding policy changed in 2014 http://huffpost.com/us/entry/5473467