A developer has created Mentwire, a social platform implementing Paul Graham's "intellectual CAPTCHA" concept that requires users to pass basic math and logic tests before posting. The platform aims to improve social network quality by ensuring contributors understand fundamental concepts. Anonymous authors remain hidden until their content receives votes, forcing evaluation based on merit rather than reputation. Currently open to Hacker News users through invites.

Users must complete an onboarding test plus daily questions before accessing feeds or posting. Mentwire employs Face ID authentication on-device and includes checks to prevent AI-generated content. Questions are sourced from Twitter/X Community Noted posts, though the creator found question sourcing surprisingly difficult. The platform's architecture aims to create a competence-interest graph rather than pure interest-based engagement like current social networks.

This implementation directly addresses Graham's repeated calls for better social network design through basic competency requirements. The creator welcomes suggestions for scaling question generation across different disciplines. By hiding author identity until voting occurs, Mentwire attempts to shift social media interactions toward content evaluation rather than personality-driven engagement metrics.