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by fidotron 4322 days ago
The true genius of Facebook is it's practically impossible to not use it, even if you're not signed up. If anyone mentions you, or happens to post a picture with you in you're in it.

The same applies for Google, where if you happen to be in the background of a photo which isn't shared but gets uploaded to G+ quietly as a backup of an Android phone (which they do by default) then Google (and by extension the US gov) know where you were, as per their demo at I/O about 3 years ago.