In her keynote on Internet Trends (PDF), Mary Meeker forecast that next generation social networking mobile platforms will drive unprecedented change in communications and commerce. The current growth of mobile social networking seems to support her thesis.The second-most popular Web activity for mobile users to engage in on a daily basis is accessing a "social networking site or blog." Last January saw 1.8-million do this, with a monumental, 427-percent increase to 9.3-million people in January