Building and testing at Facebook

This post details Facebook's approach to product testing and launching, emphasizing continuous iteration and data-driven decision-making. It introduces the concept of 'shipping early, shipping often' and highlights the use of a sophisticated tool called 'Gatekeeper' for managing A/B tests. The post provides an example of a failed feature launch (chat bar) and the subsequent rapid iteration based on measured impact, demonstrating the importance of empirical data over internal debate. It also showcases a successful small tweak that led to a significant increase in friend requests by optimizing the 'find friends' interface.