This document discusses the evolution of social networking and the key players and technologies involved. It outlines how niche social networks grew to serve broader audiences, leading to a more system-centric design focused on value over specific networks. The major current social networking platforms are described along with their key features. Open standards and frameworks for social integration are also outlined, including OpenID, OAuth, and OpenSocial. The document argues that social networking will become an important feature across many different websites in the near future.