YOLO is the new question and answer app, designed to work through Snapchat, allowing users to ask questions and send messages to each other completely anonymously. Following its release last month, it quickly become the most downloaded app in the world despite minimal advertising or promotion. Although popular, the app has received caution around its use, with the NSPCC warning of the dangers of misuse and online bullying because of the anonymity aspect. Similar accusations were levelled at the Sarahah app, which was eventually removed from mobile app stores in 2018. Scroll down to view our new online safety guide about YOLO.