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by bluGill 1629 days ago
Which ones. They can index their own, but for the others only the public stuff. Facebook has a lot of things private so nobody can see them except your friends. (they are by no means perfect, but a lot of things are private and only seen by friends - most of it isn't of interest to a search engine anyway but comments of the form "I love X product" could in a perfect world be indexed as a sign of what people find good)