Ev Williams' new startup, Mozi, is a private social network — no public profiles, no follower counts — and is meant to encourage more in-person meet-ups.

Mozi, set to debut at SXSW, aims to bring the fight directly to Silicon Valley's engagement-driven model, reimagining digital connections beyond pure follower counts.

The co-founder of Twitter is launching a new social media app at SXSW 2025. Mozi will encourage real-world get-togethers and forego likes and comments. Ev Williams is leading the venture. Evan “Ev” Williams has been a key part of the social-media world for years.