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can someone help me find out what people are searching in the internet.?

I’m planning to set up an ebook website and i would like to know what information people are demanding on the web. Losing weight? Homebusiness? what kind? or how to patch up a broken relationship. I would like to limit my search to a few categories only and knowing how to look for them is what i would like to find out. Pls help. Thank you.

Usually people search for movies, games and mp3 music, but they also search for information about countries and newest technologies.