Go to Settings, Site Settings and disable it. If somehow you enabled it in the first place.
This is my site settings. This has never changed.
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Download Opera browser with:
Facebook notification wasn't a site issue. Opera was not active and yes, I check my device for malware constantly. I'm not a 'daft' mobile user. My phone has no games, no gambling apps, no hacked or pirated software.
Facebook itself is on a lengthy list of disabled apps where various American billionaires have decreed they can't be uninstalled from MY device.
Why the Facebook ad? On an Opera notification no less.
I am not on Facebook. I never will be on Facebook. Finally if I was ever stupid enough to be on Facebook, I'd use the app that I'm not allowed to uninstall from my bloody phone!
Stop it. You're better than that.