Stumbled across an article by Irving Fang of the University of Minnesota, on the different writing styles in the mass media. A good read and very enlightening for anyone in any of the aforementioned fields.

Fang, I. (1991). Writing Style Differences in Newspaper, Radio, and Television News. University of Minnesota.

A monograph presented by the Center for Interdisciplinary Studies of Writing and the Composition, Literacy, and Rhetorical Studies Minor: Monograph Series, No. 2

Check out the paper here.