Perhaps I should clarify. The web forums on this site are examples of Web 2.0.

Think back to the mid-1990s. Web forums like this simply did not exist because the way the technology was being used.

I can recall when the first web boards were introduced, and subsequently popularized by Yahoo!, who embraced the technology.

Now, user generated content has become commonplace as a tenet of web 2.0, and, yes, this includes web boards.