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In terms of users, it’ll be Mastodon, the Twitter-alike.

goes looking for numbers

This doesn’t indicate whether “active users” is monthly active users (MAU), which is probably the most-common metric for social media, but based on this:

mastodon-analytics.com

There are presently about 750k “active users” on Mastodon.

EDIT: Oh, fediverse.observer does have statistics, and says that theirs are MAU.

According to that, they’re at 912k MAU, so maybe that active user count above is something like weekly active.

mastodon.fediverse.observer/stats

Here on the Threadiverse:

Lemmy has about 50k MAU.

lemmy.fediverse.observer/stats

Piefed about 6k MAU:

piefed.fediverse.observer/stats

And Mbin about 900 MAU:

mbin.fediverse.observer/stats

In terms of users, it’ll be Mastodon, the Twitter-alike.

goes looking for numbers

This doesn’t indicate whether “active users” is monthly active users (MAU), which is probably the most-common metric for social media, but based on this:

mastodon-analytics.com

There are presently about 750k “active users” on Mastodon.