Is a picture of a baby suckling its mother's breast obscene? If there's any areola showing it is. That's the stance Facebook is taking, and it's not going over well with users. A group on the website called "Hey, Facebook, breastfeeding is not obscene!" has picked up more than 82,000 members after mothers reported having pictures of themselves and their children removed from the site. Facebook claims the only pictures removed were those that violated its terms of service, which stipulate that photos showing a fully exposed breast constitute sexually explicit material. Angry mothers have staged an online nurse-in by posting thousands of breastfeeding pictures to the site. A Facebook spokesman says: "We agree that breast-feeding is natural and beautiful and we're very glad to know that it is so important to some mothers to share this experience with others on Facebook."