That left my Facebook icon with the dark background after the app update. My phone was not in dark mode. The iOS update to 17.6.1 also was available for my phone, which I also installed.

And the Times said its black logo on a white app background looks good even if your phone is in “dark” mode that changes the screen’s background to permanent black.

Users on X reported the change early on Friday, noting that the Facebook app's logo on their mobile devices — typically a white F on a blue background — had changed to a blue F on a black ...

"It's a feature on the iOS 18 beta. You can make your background dark plus your icons either light, dark, or tinted (based on the color of your background or whatever color you want)," said one reply.

Since 2013, the iPhone’s Clock icon has featured a distinctive white clock face against a black square background — a familiar and functional design that many have grown attached to.