The Facebook mobile-app icon suddenly turned black and blue — from blue and white — for some users. Does this mark Facebook's new dark, edgy era? Nope, it's just a bug, according to Meta PR.

Many Facebook users are confused, and a bit unhappy, after a technical issue caused their Facebook app icon mysteriously ... a blue "F" on a black tile rather than a white "F" on a blue tile.

People will see the fix when they update their app,” Meta communications ... Instead of a blue background with a white icon, the mistaken design featured a black background with a blue icon.