Mac (High Sierra) and Ipad keep asking for Facebook Password
A problem that arose a couple of years ago seems to have cropped up again: on my Mac at random times a pop-up appears that asks for Facebook password. When I re-enter it accepts but the question will randomly re-appear. I can access FB just fine in my Browser. Happened on a different Mac too. On Ipad it only happened once. How do I solve this?
iMac (21.5-inch, Late 2013), macOS High Sierra (10.13.4)