I'm going to coin a term here and I have no idea how accurate it will be. Community creationism. After being exposed to lots of different types of media and communities in the last few years, I have discovered what I think may be a human trait. It goes something like this:
As you are exposed more regularly to a media form, situation, thought process, community or other concept involving social interaction, no matter your initial thoughts on the concept, you will form an affinity for it. This affinity grows into a desire to contribute, and thus you become a community creationist. I'll explain with examples from my own life.