Working with one of its clients in the music industry, WiseWindow started analyzing 25 million comments a month with respect to the top 500 musical acts in the U.S. (Lady Gaga gets 70,000 comments a day.) The cluster analysis shows the rise and fall of intensity with respect to 84 aspects of the artists such as stage presence and music. Users can create heat maps of how hot the artists are in various dimensions.
The big news from this analysis is that there is an immensely strong correlation (r2 of .94) between record sales and social media activity. There appears to be a two-week lag between activity and sales. The implications for marketing tactics and artist management are profound. You can see a dashboard that shows how your efforts are succeeding or failing in many dimensions.