Rachel Joy Swardson went to the bathroom. Actually, hundreds of them. Far from the reach of any social media algorithm, she secretly taped up postcards with a link to a survey in public restrooms across the country. She hoped to understand why some women are better at friendship than others. Driven by her own painful friendship breakup, this former private investigator and television journalist now believes she's uncovered hidden common denominators to help us better understand platonic love.