Asset or setback? What do you think of Twitter's 140-character limit? It has certainly defined the service, but will it become a growth constraint, even as the company goes public? Vote below in the daily Hot Stock Minute poll. But first, watch show host Lauren Lyster ask Yahoo Finance Senior Columnist Mike Santoli about the matter. The pair also talk about the red hot IPO market and an impending settlement between SAC Capital and the SEC.