Today we revisit our story on Facebook and its rulebook, looking at what’s changed in the past two years and exploring how these rules will impact the 2020 Presidential Election.  Back in 2008 Facebook began writing a document. It was a constitution of sorts, laying out what could and what couldn’t be posted on the site. Back then, the rules were simple, outlawing nudity and gore. Today, they’re anything but.  How do you define hate speech? Where’s the line between a joke and an attack? How much butt is too much butt? Facebook has answered these questions. And from these answers they’ve written a rulebook that all 2.2 billion of us are expected to follow. Today, we explore that rulebook. We dive into its details and untangle its logic. All the while wondering what does this mean for the future of free speech? This episode was reported by Simon Adler with help from Tracie Hunte and was produced by Simon Adler with help from Bethel Habte. Special thanks to Sarah Roberts, Jeffrey Rosen, Carolyn Glanville, Ruchika Budhraja, Brian Dogan, Ellen Silver, James Mitchell, Guy Rosen, Mike Masnick, and our voice actor Michael Chernus. Support Radiolab today at Radiolab.org/donate.