In Web 1.0, a small number of writers created Web pages for a large number of readers. As a result, people could get information by going directly to the source: Adobe.com for graphic design issues, Microsoft.com for Windows issues, and CNN.com for news. Over time, however, more and more people started writing content in addition to reading it. This had an interesting effectsuddenly there was too much information to keep up with! We did not have enough time for everyone who wanted our attention and visiting all sites with relevant content simply wasnt possible. As personal publishing caught on and went mainstream, it became apparent that the Web 1.0 paradigm had to change.
Enter Web 2.0, a vision of the Web in which information is broken up into microcontent units that can be distributed over dozens of domains. The Web of documents has morphed into a Web of data. We are no longer just looking to the same old sources for information. Now were looking to a new set of tools to aggregate and remix microcontent in new and useful ways.
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Jason Salas.