Reddit might be a unique case because of "passion hires" -- like gaming studios. People will take far less than market rate if they are working on a project they are passionate about.

That said, I suspect "outside signaling" will become a huge thing. You tell your recruiter you need $X, your recruiter tells Reddit that you need $X, you get offered $X, how convenient for both you and Reddit! On the executive side, over dinner you discuss what it would take you to leave your current company -- of course, not negotiating, just two people talking -- and low and behold, the offer will be exactly what was discussed, of course, no negotiating.