What I would like to know is... who is using Persona, and if you aren't using it - why? It seems like the smoothest least disruptive login/authorization service I've seen so far. If you don't know what Persona is, I suggest you check out the website. It just takes a few lines of code and markup to add Persona to your website. So why isn't this gaining more traction? It makes more sense than Github, FB, Google, Twitter, etc... auth offerings. Your thoughts?