We're aware of an issue with Facebook purchases for all King Games and our team is on it. ๐ ๏ธ Hang tight while we fix things! You can still enjoy the game, and we'll keep you posted once it's solved.
You go to your profile, select "Edit Profile", "Signature Settings" and write the text "User ID XXXX" under your signature. Then save. Then it looks like mine.ย