For What purposes does People Use Internet?

I was just wondering, for what purposes do people use internet. What type of information majority of the people use the internet for?Is there any statistics that can help me?

Say I would like to know the percent of people use internet for this purpose. For Example:

10% email
50% Porn
30% shopping and so on.

Is there any statistical survey that might help me in posting in my blogs.

Thanks,

Yuvaraj
http://yuvi-internetsecurity.blogspot.com