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When a friend's Facebook is so dead it's got a 'no visitors' sign. All you get is a 'like' from their brother and a 'X is now friends with Y' every few months.
My dad's Facebook has a 'no visitors' sign. He only posts when he's forced to.
My friend only gets a 'like' from their brother. That's it.
My uncle's Facebook is so dead, it's got a 'no visitors' sign. That's what happens when you don't post.