A new online craze is sweeping social media, following the bikini bridge and the bellybutton grab.

This time, it's the collarbone challenge - straight out of China - and it involves balancing coins on your collarbone to prove that it sticks out.

The so-called craze has even evolved to users posting photos balancing other objects, like paper clips, a bunch of keys, or even batteries.

But people are being warned that having collarbones that stick out is not actually a measure of your health.