Currently, the ads you see on Facebook are based on your activity within the social media network. Soon, Facebook says, the site will also begin using information from the websites and apps you visit outside Facebook, too. Separate from the cookie announcement, Facebook is also premiering a new tool, accessible via every ad on Facebook, explaining why you’re being shown an ad, and allowing you to adjust your interests to prevent or encourage targeted marketing. With the premiere of the ad preferences tool, you can have more control over how Facebook interprets your activity.
– sent from my smartphone. sorry about typos and brevity.