The bright red dots (officially known as badges) appear on the mobile app's home screen, perhaps to alert you of a new video or new activity in one of your groups. Occasionally the alerts are redundant; popping up for a video you've already seen. The notification dots have drawn the ire of plenty of Facebook users -- there are scores of videos and how-to-articles instructing how to get rid of them.
Unfortunately, not everyone can get rid of notification dots right away. Facebook confirmed to TechCrunch that they only started testing the feature on a subset of iOS and Android users. In order to find out if you're a part of the test, go to the "Settings and Privacy" section of your Facebook mobile app. Tap on "Settings" and then scroll down to "Notifications". You should see a heading that says "Notification Dots" at the very bottom, and that will lead you to a toggle menu where you can choose which type of badges you no longer want to see.
Notification badges are just one of the many ways that Facebook keeps users tied to the platform. While such design changes may seem small, they play a huge role in how users spend time on the site. A bright-red notification can easily lure you to a video you normally wouldn't watch or lead you to read a post by a Facebook group you rarely frequent. Whether this is a good or bad thing highly depends on the user and their lifestyle. Some people savor alerts on their phone, while others view them as a source of stress or a distraction. Facebook's decision to test making the feature optional is a sign that the company wants to help users tailor their experience; rather than imposing one design change on us all.