While Facebook doesn't allow you to customize what stories you'll see first in your News Feed, it does offer some tools to help control what posts and updates can appear in it.
If you ever decide that you'd like to stop seeing updates from certain friends, you can unfollow their posts. To unfollow a friend's posts, locate and select the drop-down arrow on a post, then select Unfollow. Even though you're unfollowing a person, note that you're still friends on Facebook.
If you no longer want to be friends with someone on Facebook, you can go to that friend's Timeline and select Friends > Unfriend. This means you will no longer receive any updates from this person. It also means this person will no longer be able to see any of your nonpublic information.
Whenever you like something on Facebook, you're also subscribing to a Facebook page.
This means updates and advertisements from anyone or anything you've liked—including businesses, celebrities, bands, movies, and TV shows—can appear in your News Feed. If you frequently like things on Facebook, your News Feed can easily become overwhelmed with advertisements rather than updates from your friends.
To unsubscribe from a Facebook page you've liked, locate and select the drop-down arrow on a post, then select Unfollow.