Building Usenet: Specifications and Message Format

This lecture covers the history and relevance of Usenet, a distributed discussion system from the 1980s. It explains the specifications for building Usenet, including message format and how messages are recognized and traced. The limitations of naive broadcast and the efficiency of message IDs are also discussed. The instructor emphasizes the importance of understanding the trade-offs in storing message IDs and explores the factors that led to the decline of Usenet, such as spam. The lecture concludes with recommended readings on epidemic algorithms and randomized rumor spreading.