I was a bit worried that the Kotaku article made Mastodon sound like an insular closed club, but judging by all the new sign ups there's probably no better way to make people want to sign up than to suggest that something is exclusive...
@Gargron It's a reference to "The Adventures of Tom Sawyer". Tom convinces the other kids to paint the fence for him, by convincing them that it's a very exclusive privilege to do so.