While a surprised woman wrote: "Holy c**p, I did not know this."
And even a jewellery shop worker voiced confusion over the post.
Ej Bonifacio wrote: "I worked at a jewellery store for three years and my brain just exploded."
But a counter-argument is gathering pace as many comments suggest you should be keeping the backing on.
One of the most popular comments with over 3,000 likes said the plastic provides a purpose.
One woman said: "It keeps heavier or larger earrings in place so that they don't hang down on your ear."
Another said the plastic prevents the piercing from stretching too much and can stop you from having saggy lobes later in life.
Colleen Lyons wrote: "It's for people whose ear piercings have stretched with age."
Another chimed in saying: "They hold your earring in place so they don't look like they're drooping."
But some people have now decided to take the plastic off following on from the Facebook debate.
Carolin Koch wrote: "The moment when you realise your ears are stretched and you don't care about the plastic."
Claiming she knew along, another said: "Everyone knows to take the plastic off, I feel smart for once."
- Daily Mail