facebook Pop Quiz #13: Another form of blocking friends?

So how does facebook know if this is a friend of mine or not? What’s the criteria for being prevented from adding someone as a friend? I can’t wait to see what help the Help Center provides on this one.

friends I can't add on facebook

permalink: http://bit.ly/FB_Pop_Quiz_13

Mashable has a post on facebook’s NOT NOW option that is coming to an account near you soon.

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