There are many advertising networks nowadays, so there is still no problem in advertising for ICOs. However I shall also mention that Facebook has already updated its policy and allowed ICO ads again, jus made few rules for advertising
This problems are created in four months ago and many time discuss this Promotion problem so do not make post on old thread because it is one kind of spam box in this forum. Still most of the social medias are promote the New ICO so advertising is allowed in the many sites and think positive in future marketing always good possibilities are comes in future.