Yup, what hyet24 said is true. Not only the credibility of Facebook is on the line here, but as well as the reputation of cryptocurrency. Although I believe that Facebook has the ability to filter out the ads they wish to show in their site, the idea of cryptocurrency and ICO being incorporated with spamming can be misleading and not trustworthy. At the end of the day, the responsibility of researching and educating oneself towards what is legitimate and what is not falls under our radar. What Facebook is doing is for safety measures to assure the protection of their users, but this will also be dependent on how you handle things.