Twitter exhausts me. Even though I feel I have been very selective in who I choose to follow, the volume is overwhelming. Every time I go to review my Twitter feed, I waste far too much time in an exercise to separate the wheat from the chaff to find useful nuggets of news or insight. Twitter ought to be incredibly valuable, but in its current design, users find that to overcome the sheer volume of tweets to get noticed, they have to pump out an increasing number of tweets themselves. It's an en...