Tarleton Gillespie is a senior principal researcher at Microsoft Research New England, part of the Social Media Collective. He also retains an affiliated associate professor position with Cornell University, in the Department of Communication and the Department of Information Science. Gillespie’s current work investigates how social media platforms and other algorithmic information systems shape public discourse. His most recent book is Custodians of the Internet: Platforms, Content Moderation, and the Hidden Decisions That Shape Social Media (Yale, 2018).