Invisible Facebook Friends Can See You, But You Can't See Them

Buzzfeed - Here's how Facebook is supposed to work: When you don't want to be someone's friend anymore, you unfriend them. Or, if you just want to keep certain things private, you can adjust their access settings. The ability to back out of a friendship is as vital online as it is off, which is why this is worrying: British security researchers Shah Mahmood and Yvo Desmedt have found a simple way to create un-unfriendable zombie accounts (via the Arxiv blog).

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