@mambearpnw Maybe? With the new search feature you might be able to just search for Holly or Stephen King, but the #Holly or #StephenKing hashtags will work if someone used them. I don't get many hits on the first, but I get plenty for the second.
If you're a reader you can follow #Bookstodon or the auto-boosting group @bookstodon (this makes it easier to find people who use the hashtag), people love to talk books with those.