Whoa - 100,000 members!! Fantastic!
And also, this is both awesome and leads to a q -
presenting different content based on a user's security group
Was this a special customization you did or just use of granular permissions, etc.?
This is a customization we added, wherein we serve up alternative Overview pages, based on which one you belong to. We also added a weight property so for those who belong to more than one, there is a clear winner when choosing.