How many posts/threads/members do you think a forum needs to be considered large? I think 20,000 members, 500,000 posts and about 25,000-50,000 threads. How about you?
My forum has a bit more than half of a qualified Big-Board with 279,000+ posts and it still feels small.
I'd say it depends on activity as well. I've seen some forums with 200K post and be very dead If you have 200-1000 users on at any one point, every day, I think you're pretty close to being "large"
I couldnt agree more, theres plenty of sites out there with millions of posts that have more or less died.
I think over 500 currently active users online (with session timeout set to the standard 900 seconds - 15 minutes) would be considered large.
My own personal standards: At least 400 members online during the busy time. At least 1 million post At least 75,000 threads At least 50,000 pages indexed with the major search engines