A surprisingly difficult question for Facebook: Do I have boobs now?

Facebook and Instagram like to be thought of as progressive. But when it comes to nudity policies, a campaign started by a trans woman is finding confusion and prejudice remain

Nipples. We're all born with them, but only half of the population can show them off on a warm summer's day without people tutting, objecting, being offended or outraged. Male nipples, it's OK for the world to see. Female nipples, not so.

The same is true online in social media circles. The social network Facebook and picture-sharing service Instagram, which it owns, have a community-standards policy on nudity which permits male nipples but not female ones. It states: "We remove photographs of people displaying genitals " we also restrict some images of female breasts if they include the nipple."