I was recently asked to define web 3.0
To do so I thought I'd start off by defining web 1.0 and 2.0.
Web 1.0 - Create content on my site for others to read.
Web 2.0 - Other people come to my website to contribute content, or between sites.
Web 3.0 - Use content on other websites to create content or collaborate on my site or between sites.