How to change your Facebook ad preferences

You’ve seen them before: irrelevant Facebook ads that pop up in your feed, leaving you scratching your head. Ever wonder where they come from? 
Facebook determines which ads it serves you based on a number of factors, including the information you share with the social network, Pages you like or engage with, ads you click on, apps you use, websites you visit and information from its data providers and advertisers, it says. 
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