These are the titles on the forums. They change according to the number of posts you have.

Since MTS2 is about the Sims 2, we felt it would be fun to have actual Sims 2 career tracks as the member titles.

The first few are:
Test Subject
Lab Assistant
Field Researcher
Instructor

You'll have to find out the rest Please not that somebody with "Instructor" under thier name does *not* neccesarily mean that they will answer questions. It's just a title.