Facebook is using you, whether you know it or not. Sometimes it’s obvious: you like a page, you click share, Facebook benefits. Other times, you have no clue until a friend asks you about a photo they saw that you liked. The unfortunate side-effect to all of this is that it can actually make you an unbearable annoyance to your friends, and you probably don’t even know it. Here’s how it works, and how to stop it. When we talk about the ways that Facebook uses your personal information, we’re usually talking about why you should care about your privacy, or how Facebook tracks your activity. In this case, we’re discussing how your Facebook habits are used—with or without your knowledge—to bother your friends with ads that they associate with you. It’s a very different beast, but it can be stopped. Here’s what you need to know.