This document summarizes key points from Clay Shirky's book "Here Comes Everybody: The Power of Organizing Without Organizations". It discusses how Wikipedia is an example of mass collaboration enabled by the internet. Wikipedia started as an experiment but grew rapidly due to its open editing model and spontaneous division of labor among contributors. While most edit only once, dedicated editors form a community and are motivated by various factors. The open model is enabled by real-time peer review that quickly undoes vandalism. Shirky argues wikis thrive on "wiki love" from their community rather than collectivism.