Jim Pugh, CTO of Rebuild the Dream (and before that director of analytics and development with Organizing for America), recently shared with techPresident some slides from a New Organizing Institute training that he's done, that help illustrate the difference between viral and sub-viral growth. We all throw around the term "viral" with little distinction, and it's helpful to put some definition on it--especially as we see many references to the Occupy Wall Street movement's viral growth, or similar earlier talk about the Tea Party. Virality, says Pugh, is all about how many new people each user recruits to a cause. (Or, how many new views result from a person sharing a video, or the number of new clicks when someone shares...