“The Web 2.0 is here. We’ve had it for years, ever since the first email list was created, or the USENET saw the light. It was here before it was even called Web 1.0.”

Janne Jalkanen is a little bit upset with O’Reilly’s hype around Web 2.0, but agrees that “participation” is key, equally in the mobile space.

Janne: “How to design mobile applications for Web 2.0? Design for participation. Make sure everyone can contribute. (…) Make services that make the mobile phone users first-class citizens, and not just guys with crummy browsers and bad connectivity.”

“Web 2.0 ,” says Wikipedia,
“is a term often applied to a perceived ongoing transition of the World
Wide Web from a collection of websites to a full-fledged computing
platform serving web applications to end users. The proponents of this
thinking expect that ultimately Web 2.0 services will replace desktop
computing applications for many purposes. (…)

“An earlier usage of the phrase Web 2.0 was a synonym for Semantic
Web. The two concepts are similar and complementary. The combination of
social networking systems such as FOAF and XFN with the development of
tag-based folksonomies and delivered through blogs and wikis creates a
natural basis for a semantic environment.”