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I don't see anything wrong with the general idea, but once you get some tricky algorithms that are able to recognise objects, words, even faces to a certain extent, then everything starts linking together.
There was a site that was (is?) in beta that has a toolbar which allows you to tag people in any photo appearing on your screen, and if it recognises that face in another image it will pop up the name. To everyone using the toolbar. I believe it also lets you find other images of the same face. THAT'S the sort of thing you need to worry about, this type of reverse indexing that makes it very easy to find data about a specific person...
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