In part one of Sway’s two-part election integrity series, Kara Swisher speaks to Alex Stamos, former Facebook chief information security officer and current director of the Stanford Internet Observatory, about what went wrong in 2016 and what Big Tech can do better in 2020. Mr. Stamos — known in Silicon Valley for his willingness to speak truth to power — rose to national prominence when he departed Facebook amid disagreement about the tech giant’s handling of Russian interference in the last presidential election. As Election Day draws nearer, social media platforms are amending their policies around political advertising, disinformation warnings and moderation of online groups like QAnon. But how do these decisions get made? What do these platforms plan to do if there is a contested presidential election? And whom can we really trust? You can find transcripts (posted midday) and more information for all episodes at nytimes.com/sway, and you can find Kara on Twitter @karaswisher.