Is there an easy to understand video or image of how works, and how individual instances connect and do not connect?

Oh my god this is hilarious: en.wikipedia.org/wiki/List_of_ - some of them seem so petty! "I'm not going to play with toy carts!" :D

Where can I get an invite for an lobste.rs account?

Fosstodon

Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.