'Text me when you get home.' After joyful nights out together, female friends say this to one another as a way of cementing their love. It's about safety; but more than that, it's about solidarity. Journalist Kayleen Schaefer relays her journey of modern female friendship from a new sociological perspective: from being a competitive teenager to trying to be one of the guys in the workplace to ultimately awakening to the power of female friendship and the soulmates, girl squads, and chosen families that come with it.