Explain this pop up then.Let me be absolutely clear here. Facebook (or any app) does not have that sort of access to your device. Apps can’t scan for virus or malware or anything really. They are sandboxed. Meaning there is literally no way they can access system resources.
How do I know this with absolute certainty you ask? Because I’m a software developer for iPhone apps. It’s literally my day job for the last 8 years.