They provide e-mail addresses over their regular web interface as well. That's why the e-mail field in the account settings says '(publicly visible!)'. This guy

They provide e-mail addresses over their regular web interface as well. That's why the e-mail field in the account settings says '(publicly visible!)'. This guy is not outing a dangerous, unknown vulnerability—he's just making it a little bit easier for people to behave like obnoxious asses.