Well, I think existing ICO pages are remaining, but without ads, just for conversation and any updates for community
No way, Facebook is important media and community in ICO. The news of ico is spread out through Facebook community, groups, and pages. If Facebook is banned ico News can't spread the world.
Facebook is not the only social media website out there, however we cannot deny that is the biggest one and that is going to have a great effect especially in the icos that are smaller, a big project is going to be almost unaffected by it because it is always going to be whales willing to invest in it, but a small project that depends on smaller investors is going to have huge problems to get enough funding.