A nice little (not so little) chart, revealing that the company owning your favourite newspaper, channel or magazine, may be one of just 6 sisters. Not owning your thoughts of course, but certainly influencing them, in ways you will probably never find out:
http://www.mediachannel.org/ownership/chart.shtml

Your best defence? Read online, independent media! Harder to control, harder to censor, harder to armtwist (oouch, don't do that