#4unit 1introduction to e commerce
Introduction to Web 2.0
The participatory, social second generation of the web.
Facebook as a Web 2.0 platform
Facebook lets ordinary users post messages, photos, and videos to large audiences, comment on each other's content, and join groups — a clear example of user-generated content and many-to-many communication.
Wikipedia is a wiki: thousands of volunteer editors collectively write and edit articles; WordPress and Tumblr host hundreds of millions of blogs.