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A Facebook fanatic is someone who clicks 'like' on everything they see, even if it's stupid, just so they can look cool and get more likes themselves.
I liked this post about a cat wearing sunglasses. It had 2 likes. I added 10 more just because.
I liked the pizza place across town even though I've never eaten there. It makes me look popular.
I liked my own comment just to make it look like more people agreed with me.