Battlefield 3 blog accidentally published some screens from the game's not-yet-revealed "Battlelog" system, a web (and in-game?) stat-driven social layer that borrows its naming convention from the Autolog, first featured in Need for Speed: Hot Pursuit. The available screens show off a voice- and text-based chat interface, player progression stats, and a Battle Feed that unapologetically recalls a Facebook wall.
For PC players, it looks like you'll be able to join multiplayer games and resume your campaign directly from the website. If the Battlelog reveal is anything like the actual game's reveal, we'll be seeing a bunch of PC footage before EA finally shows off the console implementation.