Facebook constantly changes its design, which leads crooks to try new scams, relying on the novelty aspect. One of the latest ones is the “Facebook membership”.
Scammers require users to pay different monthly amounts (under $10) per memberships of all kind (Gold, Silver, etc). In the case of not paying, users are threatened with the closing of their account.
How to avoid: every since its launch, Facebook made it clear that the use of its website is and will always be free. It is stated even on the login page.