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