The same photo that was allowed on Instagram got the artist/model who posted it banned from Facebook for three days. That's because despite being part of the same company, the two social networks have different rules around exposing breasts. Instagram is cool with it. Facebook is not. Which platform do you think has the right policy?
After being banned from Facebook for three days for posting this video, artist and model Aimee Davison started a #30DaysofBreastfies campaign.
It's been pointed out in the past that Facebook won't allow mothers to upload breast feeding photos. This has brought scrutiny to the company in the past.
Davison believes that Instagram is more relaxed about breasts because it started outside of Facebook and focuses on artistic expression.
Ever wonder why Facebook has rules around nipples? Gary Ennis explains in a blog post. The tl;dr: Facebook has 1.65 billion (with a B) users and has to come up with rules/standards that can be applied to everyone. Of course, not everyone will agree with the rules, but they are in place to try and find a happy medium between freedom of expression and civility. As a private company, Facebook has every right to decide that genitalia and the female nipple is against their terms of service.