Twitter is all about live content on this fine Monday morning. First up, Twitter has added a new notification option that alerts users when someone they follow shares live video in a tweet. To enable the function on mobile, navigate to the page of someone you follow and tap the new notification icon next to the follow icon. Then select the final option, "Only tweets with live video," and you're all set. The next time that account goes live, a red alert bar will pop up along the bottom of your feed, allowing you to tap and start watching.