Mastodon has gained 106,723 monthly active users since the end of March (when Elon bought 9.2% of Twitter's shares). 93,603 are new accounts. Overall that's a 42% increase in Mastodon's MAU.
I assume this is mastodon.social. Small compared to twitter, but it’s progress.
Update: “176,000 monthly active users since the end of March”