Facebook may have already passed a technological tipping point that will make it almost impossible for any other social network to catch up, experts say. As a network grows, the cost of leaving for any individual member becomes greater, says comScore director Andrew Lipsman, until eventually the network becomes self-sustaining and effectively unstoppable. "At some point it becomes a critical mass," Lipsman argues. "It becomes so strong that [it's] difficult to unlock, and I think Facebook has reached that point."
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