The t-shirt for the Web 2.0 Expo has a blank box where you can write your definition of what "web 2.0 is." Although I have a strong bias toward disintermediation, at Trulia's offsite this year we were doing some brainstorms and it became very clear that the things I do online are not about people in general, it's all about me - what is relevant to my needs, not the needs of the general population. So, in my blank box I wrote Web 2.0 is "me-centric."