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As a side note, you can click on the drop-down arrow on the right side of a post in your feed and hit "Hide..." to hide a post. It will also give you a menu that will allow you to reduce the number of posts you see, or unsubscribe from them entirely, without actually removing them from your friend's list. Someone might have already told you in another comment, but I thought I'd mention it since you mentioned you're not overly familiar with Facebook's interface and you didn't want cause a fuss by unfriending them; unsubscribing would cause them to no longer appear on your feed while still allowing you to remain friends with them.