Tip for the new folk:
Often Mastodon’s features work the way they do because it was first populated by people who had been harassed on FB and the Birdsite.
For instance (not sorry), you cannot search Masto for a simple term. Only #hashtags. Say you’re having a private conversation about iguanas. Anti-iguana trolls will not be able to search for “iguanas”, find your conversation, and drop into it to say, “Iguana luvers suck!”
But if you are wanting to connect with new iguana fanciers on Mastodon, slipping an #iguanas hashtag somewhere into your posts will allow people to search for and find them.