'Body positivity' and 'fat acceptance' are growing movements online. But influencers who decide to lose weight often face a backlash from their fans.

According to experts, social media is making matters worse.

"The standards society has for women is unacceptable and I will not stand by it."

"The subject of 'women' was everywhere this year. And sometimes, let's face it, in disturbing ways."

Heather Witherden is a fan of clothing exchanges, but finds that her size and style isn't always available.