Fresh from announcing that Steam has surpassed the five million concurrent users mark, Valve has reported another record year for the digital download platform.
Steam now offers over 1,800 games to more than 40 million account holders, with year-over-year unit sales up by more than 100 percent for the seventh straight year in 2011.
Over 14.5 mil copies of Steamworks games were registered during the year, representing a 67 percent increase over 2010, while Steam doubled the amount of content delivered year-over-year, serving over 780 Petabytes of data to gamers around the world.
Valve boss Gabe Newell said: "Steam and Steamworks continues to evolve to keep up with customer and developer demands for new services and content.
"Support for in-game item trading prompted the exchange of over 19 million items. Support for Free to Play (FTP) games, launched in June, has spurred the launch of 18 FTP titles on Steam, with more coming in 2012.
"Looking forward, we are preparing for the launch of the Big Picture UI mode, which will allow gamers to experience Steam on large displays and in more rooms of the house."