When you go to the "user list" screen you click on the column that says "Total Posts". It will then rearrange the order from alphabetical to who has the most post. Click on it again, and it will give you the users from least to most. I just click around on the page numbers till I found where it started showing people who actually made posts, then backtracked to the last page of zero posts. Page 100 had 20 people with 0 posts and four people with 1 post. 25 users per page X 100 pages worth of users=2500 subtract 4(for the people on the last page who had 1 post)=2496 posters. Simple arithmetic.