That's how Facebook makes money - by leveraging your preferences and activities into targeted advertising. If you used Facebook to Like a favorite restaurant, vacation spot or TV show, don't be shocked if your opinion gets shared with all of your friends. Or their friends. Or all one billion Facebook members.
Fortunately, Facebook provides ways to limit and customize how it uses your personal information. I have some tips to help you avoid overexposure and possible embarrassment on Facebook. Check them out at MyWell-Being.com.