http://blog.us.playstation.com/2011/04/13/valve-reveals-portal-2-for-playstation-3-steam-details/"Steam makes its appearance on the PS3 as an overlay within Portal 2. Here, the Steam overlay provides access to Steam Friends, displaying their in-game or online status and providing a quick pathway to text chats, player profiles, friend requests, and game invites. Steam Achievements are earned in lockstep with PSN Trophies and are also accessible within the Steam overlay."
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https://www.v2ex.com/t/11434
V2EX 是创意工作者们的社区，是一个分享自己正在做的有趣事物、交流想法，可以遇见新朋友甚至新机会的地方。
V2EX is a community of developers, designers and creative people.