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Web 3.0 will be about semantic web, personalization (e.g. iGoogle), intelligent search and behavioral advertising among other things. This slide neatly sums up the main differences between Web 1.0, Web 2.0 and Web 3.0. Web 1.0 – That Geocities & Hotmail era was all about read-only content and static HTML websites.
Any veteran of the software industry will tell you that version 2.0 of any product tends to be a shortlived staging post on the way to 3.0, which is where it finally hits the mark. Windows was a classic example. 1.0 was so buggy it was hardly worth using. 2.0 fixed some serious problems but still had a lot of shortcomings. 3.0, launched in May 1990, was an instant success, and the rest of the story, as they say, is history. Don't be surprised, then, if Web 2.0 also turns out to be just a staging post on the way to a much more mature and durable Web 3.0 is going to deliver a new generation of business applications Web 3.0 era.
The Semantic Web is based on the relatively straightforward idea that to be able to integrate (link) data on the Web we must have some mechanism for knowing what relationships hold among the data, and how that relates to some “real world” context.
Tom Heath writes a cracking post on the current attempts by a few people to brand web applications that happen to perform text analysis as “Semantic Web”.