One of the tried and true growth hacking ideas is social sharing and refer a friend techniques, but Groupon puts their own spin on it.
You see, the system is predicated on the idea that a critical mass of people must agree to accept a deal before it can go into effect, meaning that if no one shares, no one will benefit. This is a brilliant application of the marketing concepts of “fear of missing out” and “sense of urgency.”
As a result of your sharing, not only do you benefit from the discount, but so does Groupon, which gains access to a whole new pool of customers to whom it can advertise future offers. Isn’t that a treat?