"we say we love high signal, low noise services but then proceed to bring the noise."
I wrote about this 2 years ago:
"People will jump to the next great thing, somewhere along the facebook-twitter-friendfeed trajectory, and they'll find it works so much better! They'll think it's because of some shiny new feature in the new tool. They'll never realize it's just that they're subscribed to less crap. So they'll start subscribing to crap again, and the cycle will repeat."