"The irrational exuberance that people felt about the stock market several years ago has been replaced by near hysteria for Twitter. I once heard an investor say that the time to get out of the market was when your cab driver started giving you stock tips. You might say the same about the state of Twitter today. It’s supposed to be about conversation. Be careful. Sometimes it feels like thousands of people talking you to death in 140 characters or less."

The best part of this Advertising Age article is his friend’s description of Twitter: “so easy to be maudlin, so easy to pollute.”