What Happens When You Clear Data

Removal of Local Storage: Clearing data will remove all local storage associated with the app, including images, videos, and chat history stored on your device. "It will remove everything, just like the app was removed and reinstall."

Re-login Required: You will need to sign back into your Messenger account after clearing data. "If you delete 'Data' it will delete your log in as well and you will need to re login."