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From stacking Cheerios on babies to dancing the Running Man to a '90s hip hop track, barely a week goes by when a challenge doesn't sweep the internet. 

But the latest bizarre contest, labelled the Panty Challenge, which encourages women to share pictures of their clean underwear has caused uproar on social media. 

The challenge was apparently laid down by Brittany Hunter from Atlanta, Georgia, who shared a snap of her clean underwear on Facebook, followed by a video.