Here is an Android app, called Firefox Focus, that I highly recommend for your Android-based smartphone, tablet, and Chromebook. Firefox Focus, built by the same maker (Mozilla) as the Firefox browser, has been engineered for our Android mobile devices with privacy, safety, and security in mind. When you browse with Firefox Focus it automatically will block a wide range of online trackers; AND, will automatically erase your history, passwords, and cookies (which, by the way, is the method used to bombard you with unwanted ads). I use this browser a lot, to supplement my regular browser when I am shopping on the internet to prevent the cookies from haunting me with ads. The install on this is small (less than 3 MB) and works great on all Android devices, including the Chromebooks that support Android app installations.
How can I reset all "PAST" public posts on Facebook to be friends-only posts?