Click the link to Zoom the image : http://goo.gl/NuDkq
“One of the many fascinating things about this diagram is that it shows which accounts tend to follow those outside their category,” Twitter’s blog post reads. “For example, the reason that blue and purple almost seem to merge into one another is that journalists tend to follow politicians, and vice versa. The same is true of TV and music, down in the bottom right, with musicians and TV stars following each other often.”
Now days most of them using twitter and people love to twit also. Specially easy to express their selves. Now check the info graphic how brans moving and responding with twitter.