Facebook has about 2.2 billion active users all over the world. It allows for the creation of pages and groups where potential investors can discuss ICOs and other crypto related issues. Due to many reported scams resulting from crypto related projects, Facebook decided to ban cryptocurrency related promotions such as ICO marketing. This does not, however, disqualify its use for accessing funds for your project as you can still create pages and get involved in cryptocurrency related groups to promote your ICO. You may even try to bypass the advert restriction by advertising your product instead of the ICO to create more awareness about your startup brand.