If Facebook is draining your battery, gobbling up your storage by caching huge amounts of data, or otherwise causing problems on your iPhone, you can delete the app and create a Home screen icon for the website instead.
To do this, open Safari and log in to Facebook. Tap the Share icon.
Select Add to Home Screen. A Facebook icon will appear on your Home Screen and you can use that to browse Facebook anytime you like.
It even looks the same as the Facebook app icon:
Now you can delete the Facebook app by pressing and holding the app icon until it jiggles, tapping the 'x' in the corner, and then pressing the Home button once.
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