@Gargron see: UGT (abbr.): Universal Greeting Time.
UGT is convention initially established in #mipslinux on irc.openprojects.net (now irc.freenode.net) but slowly taking over the world. It states that it is always morning when person comes into a channel, and it is always late night when person leaves. Local time of any member of channel is irrelevant.
right now the mastodon instances seem pretty random, but it's primed to have community-specific nodes. Say, for animation, comics, illustration.
if anyone has any technical know-how to set something like that up, it would be like twitter for animators. twitter for comics, etc...
Another detailed .gif on how to get verified.
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