Bingo, and it affects everybody.
What's worse is the corporate mainstream media uses its power to create public opinion that promotes the interests of the parent company.
Take a few hours and research General Electric for example. It has massive media holdings. It also profits from most things that government does: wars, war on terror, global warming, stimulus plan, banker bailing, and the list goes on and on. You don't hear a lot of diversity in opinion about those topics when viewing/reading GE-owned media - that's for sure!!!
That you asked the question suggests that these two films will interest you.
Orwell Rolls in Grave
http://video.google.com/videoplay?docid=-1179175516550155628
Globalization and the Media
http://www.youtube.com/watch?v=DA6M2js4vvA