www generation

Web 1.0
Web 1.0 is the first generation of the web. Web 1.0 was mainly a read-only web. Web 1.0 was static and somewhat mono-directional. Businesses could provide catalogs or brochures to present their productions using the web and people could read them and contacted with the businesses. Web 1.0 is simply an information portal where users passively receive information without being given the opportunity to post reviews, comments, and feedback.
Web 2.0
It is 2nd generation of the www that focused on the ability for people to collaborate and share information online. Web 2.0 is the name used to  describe the second generation of the World Wide Web, where it moved static HTML pages to a more interactive and dynamic Web experience. Web 2.0 encourages participation, collaboration, and information sharing. Examples of Web 2.0 applications are Youtube, Wiki, Flickr, Facebook, and so on.
Web 3.0
In Web 3.0, computers can interpret information like humans and intelligently generate and distribute useful content tailored to the needs of users. One example of Web 3.0 is Tivo, a digital video recorder. Its recording program can search the web and read what it finds to you based on your preferences.
Few differences between All generations:
Web 1.0
Web 2.0
Web 3.0
Read Only Content and static HTML website
User generated content and read-write web
Meaningful, Portable personal web
Push technology
Share technology
Live technology
Pushed web, text/graphics based, flash
Two way web, blogs, wikis, sharing, podcast, video, personal publishing 2D portals and social networks
The real time, co-creative web, Growing 3D portals, MUVEs, avatar representation, interoperable profiles, integrated games, education and business.
All media in and out of virtual worlds.
No Security required
Security breach
Security breach
No user communication
User communication is present
User communication is present