But if you switch to the web app from the native app, now Facebook is tracking all your web usage.
I use this app, which is supposed to run the Facebook mobile site in a separate sandbox from my other browsing.
https://play.google.com/store/apps/details?id=com.danvelazco...
Also a reason I deleted cookies, history and saved credentials and just use incognito for FB nowadays. It also stops the habitual browsing that gets you hooked.