The NextNY Digital Google Group was founded in March 2006.
As of April 1, 2009 it had 2169 members (note that there may be duplicates, that is members signed up with multiple addresses).
The Google Group does not provide an easy way to analyze messages (ie, message volume, who the top posters have been historically) and while some of the data is available either to members or the group managers, it’s not in a format that’s readily analyzable
NextNY Monthly Membership Growth: