Web 2.0 is an echo-chamber - let’s face it. Many deny the fact, but it’s true. Ask anyone on the street about RSS, widgets, APIs, or wikis and you’ll get a blank face. Chances are they’ll think you’re speaking another language. Even fairly tech savvy Internet users frown upon such terms and phrases. As much as we’d like to think web 2.0 is mainstream, it isn’t.
Facebook
This uses web 2.0 so they can to other pages without going oneway
google app
google one of the biggest internet company in the world and they have they own e-mail systems, of why not make a office page so when your outside going to work you can have a document on the google page and get to it when it is needed.