I think on the ICO it wouldn't affect in any way, most likely there will be changes in the Bounty. But in my opinion there is enough other resources for campaign. It possible that Riddle would be more popular in Bounty companies. I'm in the German project Vreo.io
https://bitcointalk.org/index.php?topic=2898738.msg29810876#msg29810876 And there besides Facebook there are Medium, Twitter, Youtube, Telegram, Blog articles, Signature, Linkedin campaigns
It is not like ads are not even running as it is and as long as you can prove the legitimacy, you can still get your ads running. A lot of pages were locked as a result of this and after proving themselves to be a legal company, they were re-opened.
Although, I see no way this is generally going to affect ICOs in general, since it is not like the only medium where such things can be done, but I totally believe the move will surely help to curb out some scam ICOs. Because when the promotional methods are narrowing down then chances of fishing with random people also get narrowed down which may lead to less exposure for non-appropriate ICOs.