Discuss privacy protection issues in search engines business. You can use Google as an example.
The few articles below may be initial points of research but try to find more technical analysis that also includes solutions and tools/mechanisms such as cookies that allow SE to collect your personal search statistics and provide targeted search results
What search engines know about us - http://news.bbc.co.uk/1/hi/technology/6700997.stm
This solution is about the privacy protection issues in search engines such as Google.