Wall Street Journal Online article that focuses on the diversity of various social media venues

This is a Wall Street Journal Online article that focuses on the diversity of various social media venues.
http://online.wsj.com/news/articles/SB10001424052702304419104579323442346646168?mg=reno64-wsj&url=http%3A%2F%2Fonline.wsj.com%2Farticle%2FSB10001424052702304419104579323442346646168.html