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A Facebook Gremlin is a total nobody who you and your friends added because they were suggested by Facebook. They act like a gremlin and start commenting on your posts like they're your best friend, even though they never talk to you and you hate their guts.
'This post is the worst thing I've ever seen.', From a guy who has 3 friends and no life.
'I think your dog is fat.', Said by someone who has never seen your dog.
'You should move to Alaska.', From a person who lives in a basement.