This API tour quickly teaches you how to build an activity feed with Stream. Stream specializes in building scalable activity feeds for large apps (some with >100 million users.).The backend is a custom Go/Raft based storage engine for feeds, combined with an edge network of servers around the world for optimal latency. It typically takes <10ms to read a feed.This API tour uses JS. SDKs are available for Swift, Kotlin, React, React Native, Flutter and various backend SDKs.