The cards in the photo came with my CardScan. Exactly what I need to give to other people in the office who might be interested. If they only gave me 2 cards, I’d only have made 2 referrals.
The word of mouth term for this is a “multiplier” — anything that makes it easier to share with more people. An online version of a multiplier: Make sure your tell-a-friend form has the ability to email a message to more than one friend.