NEW YORK (AdAge.com) -- Josh Bernoff is vice president and principal analyst at Forrester Research and co-author of the book "Groundswell." Keynoting the Interactive Advertising Bureau's Social Media Conference this week, he discussed how major marketers such as Procter & Gamble are using social media in increasingly potent ways. With the social-community effort detailed in this video, P&G significantly increased sales of its feminine-care products.