Why do this? Because the Facebook app is a notorious battery vampire. Offloading kills the background tracking but leaves the door open. When you tap the icon again, iOS secretly re-downloads the entire app in seconds without asking for your Apple ID password again. It’s the closest thing to a "ghost" download. Downloading Facebook for iPhone is a Faustian bargain.
Let’s rewind to 2008.
Open your Screen Time report. I’ll wait. The blue icon is likely at the top. Apple built privacy features—App Tracking Transparency, the little pop-up that asks "Ask App Not to Track"—specifically to fight this app. download facebook for iphone