For anyone who wants an invitation to join mastodon.online, let me know! Like mastodon.social, it is one of the two official communities run by the Mastodon non-profit. The difference is that mastodon.online is invite-only.
Joining an invite-only server helps keep out spammers who target mastodon.social and lets someone be part of a more exclusive community. This can help someone have a better-quality mastodon experience, overall.
Of course, to keep out scammers, the invitation isn’t open to just anyone who asks, they will have to have a posting history of some sort.
What country are its servers located?
The servers are hosted by Hetzner with servers across Europe. They call out Hetzner when there is an outage.
https://status.mastodon.online/cm722jt5p005y134nbp7jwfm2
More info about Hetzner here: https://www.hetzner.com/unternehmen/ueber-uns/
Probably Germany.