You might occasionally notice ads in the margins of your Facebook profile and elsewhere on the site. These "social ads" pair an advertisement with actions your friends have taken, such as liking a Page.

A few important things to understand about social ads: Advertisers can't see information about you or your friends, nor do they have access to your private information. Facebook doesn't sell your information to advertisers and says it won't in the future.

If you participate in social ads, your friends might see information about you that relates to the ads they're seeing. This may be a line that says you have "liked" a certain page, or they could include your profile photo with your name next to the ad. Here's how to opt-out of social ads displaying your "likes."

Once again, visit your Account Settings and click the "Facebook Ads" tab. From the drop-down menu, choose either "No one" or "Only my friends," depending on your preference.

Note: A disclaimer on this settings page explains that while Facebook does not give third-party applications or ad networks the right to use your name or picture in ads, "If this is allowed in the future, this setting will govern the usage of your information." So if you don't ever want your picture being used as an advertisement, ensure this setting is up to date.