In a 122 page report the Federal Trade Commission shows you just how your personal information is collected and where it goes.

•if you browse for products and services online, advertisers might collect and share
information about your activities, including your searches, the websites you visit, and the
content you view;
•if you participate in a social networking site, third-party applications are likely to have
access to the information you or your friends post on the site;
•if you use location-enabled smartphone applications, multiple entities might have access
to your precise whereabouts;
•if you use loyalty cards at a grocery store or send in a product warranty card, your name,
address, and information about your purchase may be shared with data brokers and
combined with other data.

The report is titled Protecting Consumer Privacy in an Era of Rapid Change