Read this article: http://www.theverge.com/2014/9/19/6409773/heres-how-well-googles-search-engine-knows-you
follow the instructions to see your google profile and and write down the preferences and interests that google knows about you.
More articles to make you think about your data. Write a response to each article in your journal.
Search Results should be private: http://www.nytimes.com/2006/08/09/technology/09aol.html?_r=0
Watch what you watch: http://www.nytimes.com/2010/03/13/technology/13netflix.html
Social Network data: http://www.nytimes.com/2010/03/17/technology/17privacy.html