Open source and decentralized social network Mastodon has more users than it thought. The service, which competes with X (formerly Twitter) and other newcomers like Threads, Bluesky, Pebble, and Spill, had been undercounting its users due to a network connectivity error.
180 users/server seems high to me, but it is probably the huge instances (such as mastodon.social) driving up the average. There are countless small instances, but users on the big servers mostly don’t notice them.