Top definition
The all knowing. It watches your every move, your every wall post, your every bumper sticker request. The ads match your exact interests and seem to guess what you are thinking...Facebrother is watching......
Billy: Whoa, I was just talking about the Used concert next week with Fred and now there's an ad for the used.

Sarah: Facebrother is watching you.
by indieallie September 06, 2009
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