Does anyone know if I'm allowed to charge users to advertise their products in a Facebook group I admin and not allow anyone else to post sales posts? Also if it's worth getting backlinks for a Facebook group? Been searching all over for the answer to the first one but I just can't seem to get a clear answer. I basically have a facebook group that has a few thousand members and there are vendors who are freely selling their products. I want to disallow advertising in my group and charge vendors if they wish to advertise.