Successful open-source projects have strong communities. What can you do to ensure that the community around your project is as strong as possible? At least two talks at today's OSCon in Portland, Oregon, will address this issue. They will look at antipatterns, things that are known not to work when building a community. These talks come just a few months after the publication of Clay Shirky's new book, Here Comes Everybody, in which he describes how society is changing as a result of the fact that the Internet massively reduces the cost of communication, publication, and distribution.