Google has been getting plenty of of publicity lately because of major changes in its privacy policy. These two articles, one from Huffington Post and one from Consumer Reports, explain how these changes affect you and what you can do about them.
http://www.huffingtonpost.com/2012/02/29/google-privacy-policy-changes_n_1310506.html
http://news.consumerreports.org/electronics/2012/03/google-launches-its-new-privacy-policy-today.html