Clearly this is a US based report, are there similar statistics for the UK and other regions of the world?

Futurologists are predicting the continual breakdown of geographic barriers and borders, and a growing "cyber" community, so any sort of statistics that concentrate on one region or another become less and less important.

Who were these players playing against? Other players in the US? Or people in Japan and Europe?

I've noticed a sharp increase in Russian and Eastern European players online - where are these stats?

There was a story a few months back, about how 200 PS3s could be used to crack security codes. This can't have gone unnoticed in the world of cyber crime. So if there's a sudden spike of Killzone players from the old Eastern Block, maybe that's what hackers do when their not trying to get your bank details when they've got a lot of PS3s to hand.

I've played Killzone 2 online alone 60+ hours so far. Granted it may not sound like much but I've played my PS3 for at least 2-3 hours almost every day and that is a lot considering I'm 21 year old full-time student and part-time employed. I think PS3 owners being more mature is obviously a factor why they might supposedly be able to use their PS3s less as we have other things to do with our lives. I don't think lack of games is an issue anymore as PS3 has a fantastic library of games and its lineup looks better than any platform for 2009 and beyond. However, I like the fact PS3 owners are appearantly more mature because except for the rare 1 or 2 occassions to date I have not heard a single profanity while playing Killzone 2 online and there are a lot of people with headsets playing that game. Whereas my only friend with a 360 says he's sick of the constant outburst of profanity and racist language on games like Halo 3 and GeoW2 online.

Have you tried the US server? It's not short of profanity and racist language. I've played KZ for a similar number of hours to you but chose the US server for the mainly English speaking players but found it little different to XBL on the moron quota, though there are less kids, the whistling to start the whole com. system feeding back is almost physically painful and not something I've found on XBL. It seems a shame if US players need to be barred to make on-line a nicer place, especially as it's usually one or two players out of 32, that act the arse.
Perhaps I should give the Euro server an other go.