12Text 1Come on -Everybodys doing it. That whispered message,half invitation and half forcing,is what most of us think of when we hear the words peer pressure. It usually leads to no good-drinking,drugs and casual sex. But in her new book Join the Club,Tina Rosenberg contends that peer pressure can also be a positive force through what she calls the social cure,in which organizations and officials use the power of group dynamics to help individuals improve their lives and possibly the word.