mastodon.opportunis.me is one of the many independent Mastodon servers you can use to participate in the fediverse.
An instance for people speaking English or French. It works on the principle of cooptation: if you know someone who is already registered, they can invite you.

Server stats:

29
active users

These are the most recent public posts from people on the social web that people on mastodon.opportunis.me follow.