Show HN: I Built Paul Graham's Intellectual Captcha Idea

Show HN: I Built Paul Graham's Intellectual Captcha Idea PG has posted about improving social networks using something like an "intellectual CAPTCHA" many times [1][2][3][4] - "Make users pass a test on basic concepts like the distinction between necessary and sufficient conditions before they can tweet." I felt the same way. This matters because it changes how the market reads current momentum, execution quality, or adoption potential.