Marco Arment – Own your identity:

"Sadly, most people don’t care about giving control of their online identity to current or future advertising companies.

But there will always be the open web for the geeks, the misfits, the eccentrics, the control freaks, and any other term we can think of to proudly express our healthy skepticism of giving up too much control over what really should be ours."

(Via Dave Winer.)