Isn't that his point? Email address is a backbone of web identity simply because we don't have anything better. Maybe we should finally get around to figuring out something better?
It's a hard problem because anything real world like a identifying number is flawed for anonymity. There needs to be a unique identifier for a web entity.
It's always annoyed me that solutions like persona etc are approaching this by simply replacing email, when shouldn't they be abstracting my online identity? I hold several "personas" throughout various sites, email addresses, and applications. However, I don't want a product that simply merges them, I want a product that is more of a "meta-persona", that lets me easily track, manage, and expand them.
Sounds like it already does kind of do that. From StavrosK above:
"It maps multiple emails to the same identity, in that you use the same password to log in with all of them. The end site gets the email you log in to the site with (I can log in to Persona with email A but let all sites know email B every time."
So based on that, if you want to expose three different identities to 3 different sites, you can set up Persona to do that automatically, without having to remember the separate emails and passwords you used for each one. I guess the only problem would be if you needed multiple separate logins to the same site, but unless it's your own site, presumably that should be rare.
It's a hard problem because anything real world like a identifying number is flawed for anonymity. There needs to be a unique identifier for a web entity.
It's always annoyed me that solutions like persona etc are approaching this by simply replacing email, when shouldn't they be abstracting my online identity? I hold several "personas" throughout various sites, email addresses, and applications. However, I don't want a product that simply merges them, I want a product that is more of a "meta-persona", that lets me easily track, manage, and expand them.