Well, where to start. For those who love to be staring at their computer screen and feel the need to be wired 24/7, Web 2.0 certainly has plenty of scope for virtual exploration and the sharing of ideas and expertise.
Wikis are wonderful, but I could live without UTube and Facebook and Second Life (I am too busy living my First Life).
Web 2.0 is great for virtually exploring worlds that you would never be able to access in any other way, but there is a very real possibility of spending so much time in cyberspace that you don't have any time for real relationships.
You're a long time dead!!