Search on Mastodon

Admins may optionally install full-text search. Mastodon’s full-text search allows logged-in users to find results from their own toots, their favourites, their bookmarks and their mentions. It deliberately does not allow searching for arbitrary strings in the entire database, in order to reduce the risk of abuse by people searching for controversial terms to find people to dogpile.

– https://docs.joinmastodon.org/user/network/#search