Steam sales increased by more than 100 per cent year-over-year in 2011 for the seventh year running, according to Valve.
The developer and publisher has released an official statement which, along with highlighting the previously reported record number of concurrent users on Steam, also reveals the continued remarkable growth of its platform.
Steam's catalogue grew to include over 1,800 games and 40 million user sign-ups (what percentage of these accounts remain active was not disclosed, however).
Steam also doubled the amount of content it delivered in 2011 compared to the prior year, serving more than 780 Petabytes of data worldwide.
"Steam and Steamworks continues to evolve to keep up with customer and developer demands for new services and content," says Valve president Gabe Newell.
"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."

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