I completed the survey.

Yvain, in the "Referrals" section I feel the wording is a little ambiguous in what you should do if you were referred by Overcoming Bias but you've not "Been here since it was started in the Overcoming Bias days". I think you should answer "Referred by a link on another blog or website" on the first one and write "Overcoming Bias" in the second question despite the "other than Overcoming Bias" in it. But I'm not completely confident that this is what you would expect, or if other people would read it the same way.