At the top of your News Feed, select the story you wish to reply to. From there, tap “Send a reply” at the bottom of the page. You will be given the option of replying with a message or just simply using an emoji. Facebook recently introduced the “Haha,” “Wow,” “Sad,” “Angry,” and “Love” emojis to the stories feature. Your viewer list will also highlight who has responded to any stories you may have posted.