No it is not a joke they have not implemented it yet and also I am in favor with this social media  banning ICO. Their first responsibility is to protect their users and usually who post ads in social media, of course it is ICO. ICO are popping out like mushrooms and most of them are shady.

Facebook has banned Crypto related ads but sometimes I can still see some ICO. Probably they are reviewing it now if it is a legit ICO or a scam ICO.