If you define Web 2.0 as content being created by users and using AJAX or something similar to create interactivity on websites, then I'd say Web 2.0 was enormo

If you define Web 2.0 as content being created by users and using AJAX or something similar to create interactivity on websites, then I'd say Web 2.0 was enormously successful - Facebook, Twitter, etc. fit that definition. I guess the big difference is that none of them got there by yelling from the rooftops, "Look at us, we're Web 2.0".