Esolang:Filter 9
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Filter 9 is the "I'm not a robot" CAPTCHA for Esolang.
This filter disallows edits from users who haven't yet introduced themselves. Introducing yourself means adding an introduction to the introduction page. (This MUST be your first edit.) See Esolang:Introduce yourself for more information.
It was added in 2013, based off of the edit logs.