在 Tim O'Reilly and defining Web 2.0 這篇看到的，Tim O'Reilly 在 UC Berkeley 演講時這樣定義：
But even more important than their enthusiasm, the users of successful internet applications supply their intelligence. A true Web 2.0 application is one that gets better the more people use it. Google gets smarter every time someone makes a link on the web. Google gets smarter every time someone makes a search. It gets smarter every time someone clicks on an ad. And it immediately acts on that information to improve the experience for everyone else.
It's for this reason that I argue that the real heart of Web 2.0 is harnessing collective intelligence.
不過這麼說來，Google Maps 就不算 Web 2.0 了？這點倒是跟想像有點出入... 不過不管怎樣，Web 2.0 必須以「人」為中心倒是沒什麼爭議。