Let’s be honest: Facebook is not designed for anonymity. It’s built on the opposite premise—real names, real connections, and a permanent digital footprint. Mark Zuckerberg has famously called anonymity "a cloak of cowardice."
Use Telegram channels with usernames. Use Reddit. Use Discord servers. Use the Fediverse (Mastodon). These platforms were built with pseudonymity as a feature, not a bug. Facebook will always treat anonymity as a violation of its terms of service. You can achieve practical anonymity on Facebook—enough to keep your name off your posts—with a dedicated burner account, a VPN, and strict discipline. But you cannot achieve absolute anonymity. If a government, a determined lawyer, or Facebook itself wants to unmask you, they will. facebook anonymously
For everything else, there’s Signal.