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All sorts of stupid things get patented, without being actually produced. I think that this is probably one of those, although you never know. I can't imagine anything but a storm of negative publicity if this was ever implemented, assuming that the average Joe ever learned about it. The only upside I can see from this patent is that it makes it slighly harder for some other evil entity to put the technology into use.
No, I wouldn't, and I can't believe anyone else would knowingly do it. Talk about an invasion of privacy!
People agree to all kinds of things in terms of service that they never bother to read, so plenty of people might inadvertently sign off on it. But I don't see this getting past the patent stage. It's such an offensive idea that I have to believe such a set-up would be doomed to fail.