What happens when, and I am pretty sure it will, the website will grow in popularity and traffic. I am sure you will not want to spend all your time doing unpaid moderation as I am sure you don't want ads in peoples faces to generate revenue. How will the moderator screening process work? Will you assign mods on a per need basis for hasthag ranges according to alphabets, or how? Also I noticed you answer a lot of important questions regarding the website in posts, maybe add these answers to the FAQ?
It could be a more prominent part of the new user flow. The concensus seems to be 'hubskiers' although I didn't coin it. I forget who did. I've seen a few people on Twitter using hubski as a term of endearment for their husband, so I think hubskiers might be less confusing than hubskies. :)