To be fair, this is not really Persona's responsibility. Pre-Persona, if you used the same email address on every signup, you already enabled this sort of track

To be fair, this is not really Persona's responsibility. Pre-Persona, if you used the same email address on every signup, you already enabled this sort of tracking. With Persona, you'd have to take the same precaution of having multiple Personas if you wanted multiple personas :). Also some people do want a single identity for the entire Internet, or at least a lot of it. Many people use the same real-name identifiers on HN, Github, LinkedIn, etc. professionally.