If we want to define ourselves, and who we want to be as community, it might be informative to explore who we are now. Therefore, I propose a census. This of course voluntary, and might reflect strong self-selection (meta? what is that?). Still, this might be anecdotally interesting.
Before actually carrying it out, we could discuss about:
whether it is worth it,
if so, what is the best approach to it
As I think it is worth it, I will add my proposal as an answer. You could comment on it, add your own, and of course argue against the whole idea though comments, votes, flags, another answer, DDoS attacks, account hacking, et cetera.