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.

Fast forward to today. The Facebook app for iOS isn't just an app anymore. It’s a digital Swiss Army knife for 2 billion mobile users. And downloading it onto your iPhone is the single most consequential tap you’ll make today—for better or worse.

Just don’t forget to close the app and look up at the real world every once in a while. The "Like" button doesn't exist there.