I have an email address that’s delivered to a group. A spammer got the email address and sent hundreds of messages per day, from a unique email address each time, so the Daily Engaged Users graph shows 250 users that day, when 200 of those users are staged spammers.
Perhaps my situation is unique (as well as foolish), but one might argue that people who are merely exchanging PMs aren’t really “engaged” in the forum. It looks like the “new contributors” graph includes only public posts and not PMs.
Hmm, and maybe staged users shouldn’t be counted in “signups?”
I guess it won’t matter much in another couple days.