It's available to any user with an email address -- you don't have to limit yourself to users that have, and are willing to use, a Facebook or Google account.
Versus rolling your own, you don't have the friction of account creation / password management for new user signups if the user has ever used Persona before, and we'll be dramatically improving first-contact before the end of the year. You can completely forget about storing passwords. You don't have to send email verifications or handle forgotten passwords.
Versus rolling your own, you don't have the friction of account creation / password management for new user signups if the user has ever used Persona before, and we'll be dramatically improving first-contact before the end of the year. You can completely forget about storing passwords. You don't have to send email verifications or handle forgotten passwords.