The combination of cameras everywhere—in bars, on streets, in offices, on people’s heads—with the algorithms run by social networks and other service providers that process stored and published images is a powerful and alarming one. We may not be far from a world in which your movements could be tracked all the time, where a stranger walking down the street can immediately identify exactly who you are.
Mobile computers are threatening the world we currently enjoy. You've already got 1984 in your pocket. Even the Walden pond is covered.