Facebook can track everywhere you go online. Keep informed, see what Kim Komando says. http://www.komando.com/tips/12299/step-by-step-guide-to-lock-down-your-facebook-profile/2 She gives 5 pages of what and how-to.
(Remember to get a better page view to read go to the link, then see if Reader is in a little blue box at the top right side of the website URL line. Click on Reader to avoid having to see all the ads on the pages. When you're on the nice clear Reader page and want to go back to the original website page just click somewhere on the page you're now looking at, and that takes you back to the page with all those ads all over it. Yes, you probably would like to see who supports her page . . . and what else she's writing about.)