But first read https://www.thurrott.com/windows/windows-10/5294/windows-10-tip-how-to-uninstall-any-app
Then tell more about the OS, supply screen shots of the app, control panel so folk can give fresh ideas.
I've also used Revo Uninstaller from http://www.revouninstaller.com/revo_uninstaller_free_download.html (look down the page for the free version.)
Having this issue of trying to uninstall Facebook from control panel that's not in the registry.
Do know that it a program developed by HP for Microsoft. Would someone please give me a hint how to remove.