Côme Chilliet is a user on social.chilliet.eu. You can follow them or interact with them if you have an account anywhere in the fediverse.
#LibreMonday lichess.org is an awesome website for playing and learning #chess. The only thing I’m missing from chess.com are the correspondence tournaments.
The #lichess android application is also great, and even provides offline tools like a blitz clock to play chess on a real board next to the phone (which seems better than the stand-alone one I found on #fdroid - not sure why lichess app is not on fdroid).