There's an instant camaraderie there, based solely on a shared interest and brief bits of what we perceive about ourselves and those around us.
I wonder how we are impacted by the new way we establish relationships. For example, how many of us know people we've met online, but have not officially met our neighbors? This is true for us.
How do new social networks help or hinder us? Should we go back to a more community based society, or should the world literally be our playground?