I just asked. said i was an old witness interested in the history. I taught history at the university level ages ago. That was a plus. They've been more cautious lately I think. They threw out three or four a few months ago. One of them was tosed out for publishing their photos on another blog.
The private blog has whole chapters in rough draft, photos, essays. It's a very rich blog. The rules are that comments must be to the point. They don't discuss theology. Not everyone is a witness. there are at least two professors from various colleges who aren't witnesses. Most are witnesses best I can tell. Many have some professional credential too. (Rare among witnesses). you can always ask. but i think they say 'no' more than they say yes.