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. So I built one using a mix of simple math, logic, and Twitter/X Community Noted posts. Try sample questions here - https://mentwire.com/sample - without signing up.

- Invites are temporarily open to HN users.

- Onboarding test + one daily question before accessing feed, post or reply.

- Posts authors are anonymous until upvoted or downvoted, forcing evaluation of content on merit.

- Face ID (on-device only) to post/reply, pangram checks for AI text.

Sourcing good questions turned out to be much harder than I thought. If you have suggestions to scale this, I would love to hear. Eventually, could be gated across disciplines/topics to get a competence × interest graph instead of the pure interest graph of today's social networks.

[1] https://x.com/paulg/status/1235949761359904768 [2] https://x.com/paulg/status/1576517990182359040 [3] https://x.com/paulg/status/1514979883948126209 [4] https://x.com/paulg/status/1505842647319126016

Repost from https://news.ycombinator.com/item?id=47577829.

This link contains a full quiz and linked directly to sample to try without signing up.

user:	throw_winblows
created:	March 20, 2026
karma:	4