Captain Button on Nostr: Thanks. But how are hashtags with zero posts created? #yasid didn't exist before my ...

Thanks. But how are hashtags with zero posts created?

#yasid didn't exist before my post.

#storyidentification existed but had no posts before mine.

bluecover exists but has no posts.

bookwithabluecover does not exist.

(Bookstore people get a lot of requests for "a book with a blue cover I read when I was a kid. Or so I am told.)