When I checked yesterday it was 91,000 users, it’s now 109,000 and counting up fast!
100,000 🎉
Stats can be found here: https://the-federation.info/platform/73 - this site has been hugged to death for the moment.
Stats can also be found here: https://lemmy.fediverse.observer/dailystats
You can access their content, but you can’t really participate, unless you have an account on one of the instances they’re still federated with.