In the cut-throat world of tech startups, it takes a lot to say no to a Facebook acquisition and face the possibility of being crushed by the social media behemoth, so why did Snapchat founder Evan Spiegel risk it?

Billy Gallagher, a tech writer and former frat brother of the Snap founders, joined "Salon Talks" to answer just that, which he explores at length in his book "How To Turn Down A Billion Dollars: The Snapchat Story." Gallagher goes behind the scenes of the creation of the "sexting" app that became a social phenomenon. To hear the full story behind the founding and how the Stanford graduates made it to a multi-billion dollar IPO, watch the video above.