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(store.steampowered.com)
Steam is a video game digital distribution service by Valve.
Steam News | Steam Beta Client news
Useful tools:
SteamDB
SteamCharts
Issue tracker for Linux version of Steam
They're doing IP location checks, and they're doing them badly (there's not really a way to do them well). It's not working for me with people in the same town, and other people are reporting it's randomly working or not working with locations in the same neighborhood.