Regarding members: They have a forum set up. As of June 2015, there are 900 posters (on the forum) registered.
From the post by Ender: Re: User Total Milestone Thread Postby ender » Sun Jun 21, 2015 11:48 pm
Some more statistics:
There are 317 members with exactly 0 posts (a lot more than I expected). Perhaps they have contacted people privately and someone could know if they are "one of us", but we have no data to confirm this. There are 325 members with 1-10 posts. We could say that at least in none of their posts they said anything that indicated they were not "one of us" That leaves, at the current moment, 911-317-325=269 members with more than 10 posts, out of which 206 have been active in the last month (well, there are some members with 10 or less posts that have been active in the last month, so these two groups kind of overlap.
Hence the number 269 as of June 2015 would be more correct.