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Four years ago, a new Web site called Flickr debuted with an invitation to photographers—
amateurs and professionals alike—to share their photographs online with family, friends, and (if desired) complete strangers. Since then, some 20 million people from around the world have joined up (there’s no charge for most accounts) and uploaded nearly 2 billion photos—and nearly 1.9 million of them have a Chicago connection. Here are the 13 standouts from our picture-perfect city.