There are a few personal details to fill in and the final registration page offers you more free space for referrals, which is a nice touch.

BBC: Weebly website

"I can't tell you how many times we get referrals for one diagnosis, and it actually turns out to be something different, " Bienstock says.

CNN: Five diagnoses that call for a second opinion

Zao is building a system to create referrals through your social network, enabling you or employers to give referral fees to anyone who suggests you or others for a position.

FORBES: Social Recruiting Goes Wild