Facebook flags Linux topics as 'cybersecurity threats' — posts and users being blocked
(www.tomshardware.com)
It's a bit more complicated but the video I linked suggests using DuckDNS and a Wireguard VPN. It certainly works though in my experience it can be a bit of a pain because of CGNAT. If you have a reliable static or long-lived IP lease on IPv6 though it's much less clumsy.