[darrennix]

It sounds like you would benefit from offering a menu of registration choices: - Facebook / Twitter / Google - Email+ other

As with AirBnB registration, you would strongly encourage users to register using a social media auth but allow them to use an email + nothing else if they desire.

You can then apply a simple risk scoring model that says (I'm simplifying here):

* Facebook + 200 friends + > 3 year account age = auto-approve

* Email only = red flag; manual verification

Critically, you don't reveal to red-flagged users that they've been placed in a sandbox.

[sgb_QQ]

That's an interesting idea, thanks. We wanted to avoid any concept of registration (ie all appointments are currently 'checkout as guest'), since it's an experience barrier, but Fb/Tw/G+ are good human verification tools.

[sebie]

Genius idea. Not OP, but might use for my own projects :)