Half of Groupon's failure is the email spam model, another half is the business partners. If you signed up for a service where you give discounts and got any le

Half of Groupon's failure is the email spam model, another half is the business partners. If you signed up for a service where you give discounts and got any less than a shining smiling face when I come in with one, guess what - I'm not coming back to you. Groupon should have screened businesses the same way Apple screens apps, very carefully.