A recent sudden jump in registered users is partly due to a group who have chosen to use this site as an online discussion tool. They have chosen to have their forum private, so unfortunately you won't see any activity unless some of their members choose to participate in other discussions. This is the first group to use this site this way.

Hopefully other groups will come forward to also have their own forum and/or wiki pages. Other options for groups are to allow public input or to allow the public to read posted information but only certain users can create or edit that information.