The “About” page also provides some stats at the bottom:
https://forums.online-go.com/about
Note: you can hover your mouse over the approximate numbers to see the exact number
According to that page, we currently have 10,094 users, which contradicts the 10,000 listed on the user stats page. Note that there have only been 793 active users in the past 30 days.
We are also approaching 10K topics (currently at 9,862).