For me it is not surprising if fb did block all that advertising stuff,Fb is one of the major platform on social media thats been used by millions of people worldwide,advertising something that beyond expaction of its user and the risk with it might make the social media to be the responsible.Anyway i have seen also some groups that i think from an ico but did not detected by fb,so i think it is not a total bad news for ico's who uses fb for promoting their project.