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Yeah, about 1,100 of users contributing to the platform. Also most of them were humans. I count only posts, comments, reblogs and follows towards the actions of a "human" user. Too many bot activity to include voters in this metric.

Accounts, not users. There is a quite significant number of people here (especially now that the user base has shrunk and many of those remaining are involved with various initiatives and business, often with their own accounts) who post and comment on multiple accounts on a daily basis. There are also some automated comment bots, a few automated post bots, and a few automated reblogs. Although the effect is certainly much greater with voting, even with posting and commenting, the number of actual people is smaller.

Accounts, not users.

Sure, you're right, accounts is a better term.

"a few automated post bots, "
Which ones are automated posts?

I don't remember which ones exactly but I've seen some games that are posted in the exact same form every day. I would guess those are automated or if not they might as well be. Also some posts like the daily curie are obviously script-generated. Again, maybe not literally autoposted (or maybe) but might as well be. Likewise other statistical tables that go up every day, such as a summary of posts in 'cn', an exchange flows post, etc.