Yes, this image was reported by someone as obscene nudity, deemed too offensive for Facebook, and removed. I received a one day ban for it. The same has happened for even more obscure images. There is this story, for example, of a women banned for breastfeeding photos: http://blog.sfgate.com/sfmoms/2013/04/05/sacramento-mom-banned-from-facebook-for-posting-breastfeeding-images/
This article has an actual link to their policy manual, which they have tried to keep hidden from public eyes: http://www.webpronews.com/facebook-content-standards-arty-nudity-okay-moose-knuckles-not-so-much-2012-02
As a result, from here on out, any photo that might possibly be deemed offensive by draconic Facebook policy will be shared this way. You can then share the link and let others know and judge for themselves, instead of allowing one person with ridiculously high and unrealistic moral standards to decide for all of us.