Today's online edition of Brandweek is carrying a story by Todd Wasserman, "Is Twitter the Next Second Life?" (http://bit.ly/dyxkBZ). The rise of Twitter has been nothing short of a digital phenomenon and along the way it has spawned both fans and critics. Wasserman takes a look at the numbers and concludes that growth is slowing. He also cites the usual marketing examples of success (Dell and Comcast) and failure, or at least disinterest (Delta didn't post for six months).