2020 year in review: Connectivity innovations, faster apps, and progress toward net zero

This post details the adoption and impact of QUIC and HTTP/3 on Meta's internet traffic, showing significant improvements in request errors, tail latency, and other metrics. It also highlights the complete rewrite of Messenger for iOS (Project LightSpeed) resulting in a smaller, faster app with fewer lines of code, and the redesign of the Facebook web app using React and Relay. Additionally, it covers the use of automation and ML for infrastructure hardware maintenance, new tools for engineers (Health Compass, Incident Tracker), and hardware optimization for microservices (SoftSKU, Accelerometer). Connectivity innovations include aerial fiber deployment robots, the 2Africa subsea cable, SuperCell for rural connectivity, and the Evenstar program for affordable broadband.