This morning we woke up to a massive and ongoing stream of spam registrations here on HASTAC.org. We're going to limit new user registration until the wave subsides (or until we can get CAPTCHA working better). After you sign up, one of us will manually approve your account, which can potentially take a couple of hours, or longer if it's after business hours. If you would like to register and can't please contact us and we'd be glad to create an account for you.
This is just a temporary solution. We're sorry for the inconvenience.