Facebook F8 (pronounced "eff eight") is a mostly-annual conference held by Facebook, intended for developers and entrepreneurs who build products and services around the website. It takes place in San Francisco, California. Previous events have started with a keynote speech by Facebook founder Mark Zuckerberg, followed by various breakout sessions concentrating on specific topics. Facebook has often introduced new features, and made new announcements, at the conference. The name "F8" derives from the tradition at Facebook of having a big eight-hour Hackathon just after the event.The scheduling of F8 has been somewhat erratic.