Manifold created a community group on Twitter (https://x.com/i/communities/1802848512008483257), which has grown enough to send a similar question to very high probability rather quickly (https://manifold.markets/Gen/will-the-manifold-twitter-community).

This market will resolve based on the number of members listed on the Twitter community at 5pm on June 24th, approximately one week after the community group was first created.