?share=1, though it's not a secret, it was posted about when this change went in: https://blog.quora.com/Making-Sharing-Better

Then again, who's going to find that old blog post :P

Thank you!!

(I figured out you don't have to pass anything specific into the share parameter, you can do "?share=poop" or even just "?share."

Hah, nice :)

Also, this parameter used to (maybe still does) set a cookie so that you can browse around the rest of your session without worrying about a sign up modal.