about 3500-4000 at peak hours and around 1100-900 or so when the majority of the American players are asleep.
I haven't seen more than 2500 or so at a time. My daughter is amazed that I keep recognising people in games. On the 360 she hardly ever runs into the same people frequently.
I wish more people played multi-team. It's good for a laugh every now and then.
It has been as high as 3,998 from my view, others have reported over 4,100 on weekends. That IMO is not bad, I mean by all accounts the U still has not sold 1 million units in the the US last itme I looked, and we are getting near MW3 numbers with about 3% of the amount of consoles.
Did you really just instruct someone to search the Internet for the truth? I never thought I would die like this, but I always hoped...