I see that Mastodon 3.0 has been released, removing OStatus support. My instance only supports OStatus, so that means as 3.0 rolls out, my connections with the rest of the ActivityPub fediverse will gradually be cut.
Au revoir, tout le monde ! À bientôt, j'espère.
Originally, Mastodon communicated with the OStatus protocol, then it added support for the ActivityPub protocol. Now, in version 3.0, Mastodon is dropping OStatus.
The code for my instance, mastodon.club, was forked from Mastodon in the OStatus only days. Once scholar.social moves to Mastodon 3.0, I expect that it will be impossible for you to read my posts, or for me to read yours.
I picked mastodon.club a few years ago because it was relatively small, friendly and general, as well as Canadian. The community was quite nice, though some people have since moved to other instances. The differences with trunk Mastodon were small at the time.
Eventually the code of mastodon.club will be upgraded or else the users will leave it. The sysadmin is busy these days though, so I don't expect an upgrade any time soon.