fosstodon.org is one of the many independent Mastodon servers you can use to participate in the fediverse.
Fosstodon is an invite only Mastodon instance that is open to those who are interested in technology; particularly free & open source software.
If you wish to join, contact us for an invite.
To follow up on the #phosh breakage due to a glib update: Mobian has a fixed phosh version 0.21.0-2~mobian1 up now. It should be safe to upgrade again. It will take a few days until the fixed version will arrive in Debian testing.