Reading Response Web 2.0

The Tim O-Reilly website talked about Web 2.0 and compared and contrasted the difference between this Web 2.0 and Web 1.0.  The description of Web 2.0 was not extremely straightforward, which leaves me a little bit confused as to all that Web 2.0 all entails.  I know it encompasses technology such as most modern web features like Google search engine, double-clicking, and voice search, and the author provides visuals to explain.  They reference Yahoo, Google, Ebay, and Amazon as being the web giants that survived web 1.0 to go on to be successful in Web 2.0.  I thought it was really neat to learn how Yahoo started.  They started as simply a portal that hosts links to thousands, then millions, of links to other websites.  This seems simple now, but I am sure it was very convenient when the internet wasn't as organized of a place.