There are lots of definitions of Web 3.0 floating around. Tim Berners-Lee, a father of the World Wide Web, talks about the "Semantic Web," a way that computers employ the meaning of words--not just pattern matching--along with logical rules to connect independent nuggets of data and so create more context for information. The formula that make the most sense to me is this: Web 3.0 results from combining content, commerce, community and context, with personalization and vertical search. (Forbes)