Eighteen-year-old New Yorker Sophie is not trying to catch up to the accelerating pace of Web change. The Web is trying to catch up to her.

Once the school day ends, she says, the line blurs between online and offline. She does her homework with the chat client open. "Wikipedia is probably my best friend right now," she says, adding that Wi-Fi means she's always connected. She dips in and out of fashion blogs, big media like InStyle.com, and forums. MySpace profiles, with their mediocre design and look-at-me explicitness hold little appeal. "There is something very contrived about it," she says.

"What will distinguish Web 3.0 is the professionalization of 2.0," says Mike Bloxham, director of insight and research at Ball State's Center for Media Design. Users' tools for creating their own content are accelerating even as big media places more of its prized TV shows, music videos, and news stories online.

The line between professional and amateur content will blur, but more importantly, media properties and personal lives will mingle in new ways.

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