Great Regulars: In Web 1.0, you sat at a desk,

looked at a screen, visited search engines and sites on something called "the Web," and looked at what they had.

In Web 2.0, people are less tethered to desks and moving toward, among other things, the mobile phone to make a customized, self-created universe of Internet uses. The puzzle pieces of this universe are apps, each devoted to one particular activity.

from John Timpane: The Philadelphia Inquirer: Web's next version? Inversion

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