Problems with Spam!
So it turns out the internet is full of evil spammers who deserve to be punished a lot. If we leave registration open, then we get spammed to death by people and that's a real pain in the arse to deal with.
There is a way in though! Just DM me on Twitter - my username is @tomcoates and anyone can DM me - and if you seem like a sensible person, I'll respond with the secret URL to get into the site. This URL will change periodically, just in case. Make sense?