My local communities are on (in order of popularity): facebook, telegram, discord, facebook messenger, signal. Some attempted to migrate to mastodon and bluesky but those were all failures, since getting a large and diverse group to sign up for something new is a herculean task. You just need one popular poster to refuse to leave a platform for everyone to refuse to leave. I personally just use burner accounts under my hamsters name for everything, lock down my permissions, use an RSS reader to see all my groups and friends facebook posts without having to visit (feedbro, all posts set to public).