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Or Twitter

Or LinkedIn

Or Xing

If you visit certain sites while logged in to Facebook, an app for those sites will be quietly added to your Facebook profile. You don’t have to have a Facebook window open, you don’t need to be signed in to these sites for the apps to appear, there’s no notification, and there doesn’t appear to be an option to opt-out anywhere in Facebook’s byzantine privacy settings.

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And given Google’s increasingly clammy pervasiveness and predilection for issuing spurious DMCA take-down notices, don’t be surprised to find YMBFA elsewhere in the near future.