I think that's a very good move by Facebook and Instagram. I saw a lot of scam ICO advertisement there, it was very annoying. I hope Google will follow same thing and we won't see any scam ICO advertisement in Google adsense/adwords spaces. They have to regulate ads to protect potential customers.
That's for sure. But, this news came just in time. Do not you think it suspicious? Simply the market is in the dump, and then slid another few points down. Very quickly go bad news and go one by one...
I don't think that affect crypto-currency prices. Something needs to be done and they took an action, this is not an unexpected move. Price crash depend on the bubble phase, all coins were overpriced. Correction was needed.