- https://fediverse.kranglabs.com/ – tracks servers which use GNU social and its predecessor StatusNet
- https://the-federation.info/ – tracks servers which use Diaspora*, Friendica, Hubzilla and Socialhome
- https://instances.social/ – tracks servers which use Mastodon
These sites are very useful for tracking the user growth of federated, decentralized social networks as well as their geographic location, site-wide themes, and primary languages. I’m also intrigued by Socialhome, which departs from the “river of statuses” social media layout to use a tile-based layout.
The problem with this fediverse is that Diaspora’s protocol isn’t compatible with OStatus, which is used by Mastodon and GNU social. Friendica and Hubzilla (which forked off from Friendica) are compatible with both protocols via extensions.
I also notice that the most populated servers – https://pawoo.net, https://mstdn.jp, https://mastodon.social (all Mastodon), joindiaspora.com and http://gnusocial.no all have likely hundreds of thousands of users.
