@moonman I like it; works well. I mostly use it via IndieAuth ( http://indiewebcamp.com/indieauth ) these days. Occasionally used it on mozilla websites too. Haven't seen it in a lot of other places, unfortunately. I like that it's decentralized (you can be your own Persona provider if you want). I thought it would make more sense to users than OpenID since it works with email addresses and not URLs, but in the age of "Sign in with Facebook" (or whatever) it's a tough area to gain traction in, I guess.