By Michael Blankenship, PepperDigital "Inc500 Social media is on the rise among the Inc. 500, according to the results of a study conducted by the University of Massachusetts Dartmouth Center for Marketing.  Dr. Nora Barnes and Eric Mattson surveyed the 2007 list of the fastest-growing private U.S. companies and targeted the same companies this year to determine the rate of adoption of social media strategies among the companies. The most overwhelming finding was..."