Originally Posted by M1sT3rM4n
Though a good initial effort to determine user activity on Steam, this study leaves out a very important variable: player idle activity in game. For example, up until recently where Valve patched idling for items, many players did just that in TF2. Do those hours get counted into the grand total for playtime?
As long as the .exe is open, steam will track it's playtime, no matter if you're just sitting at the main menu or actually playing it.
However, like others have said, if your account is offline it will not track any playtime.
Originally Posted by MapRef41N93W
Originally Posted by Baghi
These stats can't be 100% accurate for single player games, because Steam doesn't track "offline mode" hours. Also, I see Dota 2 beating TF2 in those stats? Could be due to the issue some other user pointed out. I mean, it's a 2007 game man and Dota 2 just came out compared to it.
Nope, Dota 2 definitely beats TF2. It's been widely available for almost 2 years now, and at any given point has anywhere from 5-10x as many people playing than TF2 if not more.
Not only that, but like I mentioned above steam didn't start tracking playtime until 2010.
Even with that said, TF2 in the 4 years of steam tracking playtime, has never seen more players than 150k in one day afaik, while like MapRef said, Dota 2 has atleast half a million a day, well, every day. Even around the time of the beta it had around the same amount of people playing it as there were TF2.