More than 30 charities set aside their own causes for a day to support Free a Girl and its fight against human trafficking and child prostitution in Asia. These 30 charities donated their logo, print ads, banners, Facebook page, tweets, website, billboards and even their ambassadors. That's how Free a Girl went from relatively unknown to a trending topic with more than 15 million impressions. And most importantly, Free a Girl was able to directly free more girls. Agency: TBWA/Newboko Amsterdam.<...