Friends--until I delete you.

• Position: THE WEB - Facebook - Brief article

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Facebook users--all 150 million of them--are still figuring out the etiquette of "un-friending" : how to do it, when to do it, and how to get away with it. "If someone with more than 1,000 friends un-friends me, I get offended," says Greg Atwan, an author of The Facebook Book, a satirical guide. "But if someone only has 100 friends, you understand they're trying to limit their intimates." Atwan, a 2005 graduate of Harvard (where Facebook got its start), recommends culling your friend list once a year to remove total strangers and hangers-on. Keeping your numbers down, he says, gives you more leeway to be selective about who's on your list in the first place. It can be jarring to be un-friended. After all, the person...