Try the following websites to help you get some ideas. Also, read newspapers, watch TV news, talk to friends.
UKCISA
Office for National Statistics
EAP Month One - First seminar: The Media
Here are some links to useful sources of information for your media seminar:
BBC Charter for Media Literacy
Media Studies - The next generation
http://www.guardian.co.uk/
http://www.guardian.co.uk/
http://www.ppu.org.uk/
http://www.aber.ac.uk/media/
Global TV Market data
And an excellent song by the Disposable Heroes of Hiphoprisy - 'Television, the drug of the nation'
http://uk.youtube.com/watch?v=
These will help to give you a general idea, but for more 'academic' information and research, you will need to search a little deeper. Try the recommendations from the library . To access some journal articles, you will need your Username and Password.
You might also like to watch some videos on the subject:
You might like to watch a couple of short videos on the subject of media literacy and the influence of TV.
To find them go to Google Video and search for 'Panorama - Is TV bad for my kids?' and 'Becoming the Media' (Parts 1 and 2). And a discussion 'Media Literacy - The experts' here
Have a nice weekend..