Three years ago, when I wrote my first column for Discover, many of the popular sites on the Web didn't exist. The social-networking MySpace—the bane of parents everywhere—is the fourth most visited site on the Web but just two years old. The explosively popular YouTube was launched just last year. The file-sharing service Bit-Torrent, which may account for a third of the data flowing over the Internet, only recently hit its stride. Entire genres of Web sites have gone from esoteric to mainstream in just a few years. In 2003 there were about half a million blogs. Today there are 30 million.
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