Imagine

"Imagine that when you shopped online for a digital camera, you could see whether anyone you knew already owned it and ask them what they thought. Imagine that when you searched for a concert ticket you could learn if friends were headed to the same show.

Or that you knew which sites - or what news stories - people you trust found useful and which they disliked. Or maybe you could find out where all your friends and relatives are, right now (at least those who want to be found)."

Fortune

I just imagine how this would be misused...