[callahad]

I contest that GNU Mailman, the Eclipse Foundation, Firebase, the Born This Way Foundation, and Discourse are hardly "minor, at best." Not to mention extensive dogfooding within Mozilla itself.

Less flippantly, these things take time. While the initiative has been public for some time, it's only been in beta for roughly 6 months. It would be irresponsible for many organizations to jump on board this early, and taking that as a sign of failure is disingenuous.

[StavrosK]

Well, as both a developer and a user, I hope that Persona catches on. I certainly use it on all my new sites, and preach it whenever I can.

It's definitely still early. Hopefully it will spread quickly.

EDIT: Where's the Firebase signup? I only see a Github and a plain one.

[callahad]

Firebase added Persona support to their API for apps built on Firebase. It's not (yet) supported on their home page.