It's not censorship. Facebook is not restricting freedom of speech nor are they preventing anyone, anywhere from publishing content of any type in any manner of their choosing.
Facebook provides a service. Part of that service is providing you content THEY want to deliver. Don't like the content Facebook delivers? Don't use Facebook.
Is it censorship that Facebook doesn't provide me with my daily BBW jerk off material? Did Facebook shut down the BBW porn site I visit? Did the government, using force of law, manipulate hinder or block any of the stories provided by Facebook, or prevent me from obtaining BBW jerk of material on the internet or printed media?