Persona allows you to keep your network activity private from providers. It's the same in a couple of important aspects, though: 1. You still have to remember

Persona allows you to keep your network activity private from providers. It's the same in a couple of important aspects, though: 1. You still have to remember which email you had used to login. This was heavily criticized with OpenID ("did I login with Google or MyOpenID?" kind of situation). With emails it just got worse, as you will have problem, especially if you're trying to fight spam using service-specific emails (hackernews@foo.example.org). 2. You still can't "migrate" from one email address to another. Shall your email provider go down or you lose your domain - you lose your identity. 3. You still don't own your own identity. The identity is just leased to you by your email provider (or your domain registrar).