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“Mastodon for Harris” is a Success Story for Fediverse Activism
(wedistribute.org)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
It's a reference to an anecdote that Harris apparently uses frequently.
That's all I know, never cared enough to learn a politicians' lore.