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Placing a friend on "hide" in your facebook news feed. In essence not being able to read every little thing happening within their personal bubble.

Simply put...you can secret delete someone you would like to delete from your friendlist, but don't want to go through the agonizing experience of having to explain it to them.
Jim: Hey, Joe...did you read what that moron Dave posted as his Facebook status last night? Simply the dumbest thing I have ever read.

Joe: No, I've had him on secret delete for a couple weeks now. He is such a feedclogger If I didn't work with him I would have deleted him completely.
by Crimson X December 04, 2010