Source Vitrue released a report on the Top Social Brands of 2008 based on an index the company launched last year. The top social brands list is a result of Vitrue’s daily analysis of over 2,000 popular brands. Each day, the team analyzes online conversations on a variety of social networking, blogging, microblogging, photo and video sharing sites. Virtue then applies a series of algorithms to measure the frequency of keyword usage, the size of the social media environment, and…