If you are on Facebook and have seen that your Facebook stopped working, it could be a result of poor internet connection or an outdated Facebook mobile app. To resolve such issues, you can follow the serie sof troubleshooting mentioned under:
1. Check if the device you are using is connected to the internet.
2. If you are using a mobile device, change the mode of internet connection. From either the cellular data to Wi-Fi or vice versa.
3. Check if the Facebook mobile app you are using is updated. If not, update the app and check if Facebook starts working fine.
4. If you are facing the issue using a web browser, check if the browser you are using is up-to-date. Also, clear the cache files and cookies from the browser.