Because of this thread I made probably the most useless update to cm.o so far, but it might still some people's curiosity. There's a text below the list of users on the right side of the page. This used to show only the number of guests and and logged-in members. It now also bots and spammers.
Explanation of the categories:
Guests: Users that are not logged in and also don't fall into any of the below categories.
Members: Logged-in users.
Bots: Sessions reported as coming from bots. These are mostly legitimate search engine crawler bots. This includes a certain ChipMusicHeartBitsSpidy, btw. 
Bot dupes: I noticed that some crawlers (especially Yandex. Edit: I mean Baidu...) created a lot requests from different IP addresses which created a lot of unused sessions, which would sometimes boost the guests numbers really high. Those are now sorted as duplicates.
Spammers: This indicates that a session has been blocked by one of the various automatic spam detection methods in place on cm.o.
A session can only be in one category at a time.
Now you know.
Last edited by nitro2k01 (Sep 22, 2013 8:40 am)