The Facebook option was sanctioned by the court only after other methods of serving were exhausted and there's no indication of when (or if) "poking" someone of Facebook will carry the weight "you've been served." However, with 140 million users, the courts turning to Facebook merely reflect the growing reach of social networks and their legitimacy.
But legitimacy carries with it other concerns and raises questions worth considering. Subpoenas for e-mail are now common in legal proceedings -- it stands to reason that social networks will become a rote step in legal discovery. When you accept a friend invitation, does that mean you're on the hook to be deposed if that person is ever on trial? Time to rethink that friends list perhaps.
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