How to control the ads you see
Be conscious of the content you engage with on Facebook. For example, if you’d like to see fewer ads related to gambling, unfollow gambling related Pages.
Hide ads by opening the menu in the upper right-hand corner of an ad and select Hide ad. This won’t change how many ads you see, but it will make the ones you see more relevant.
From the same menu you can select ‘Why am I seeing this ad?’ to hide all ads from that advertiser.
Finally, the Ad Preferences tool gives you further control over what influences the ads you see.
Controlling gambling related content you see on Facebook Next page
Updating your ad preferences using the Ad Preferences tool