From the contest description:

• Any social change organization that creates a Razoo Group and recruits at least 100 members to join by September 15th will be entered into the Change Your World Contest.

My interpretation would be that the members don't necessarily need to be new Razoo members, just new members to the group, no?

Beyond recruiting a 100 members, for the voting process, I think it would be helpful to have some meaningful, constructive discussion around a topic. Lars, what is your most immediate need for Peace Tiles at the moment?