Collaborative comparison engine
| Groupon | |
|---|---|
| Website | http://www.groupon.com/ |
| Like | |
| Product details | |
| iPhone application | No |
| Newsletter | Yes |
| Refer a friend | Yes |
| Loyalty program | No |
| Available cities | USA |
| Social Networks | |
| http://www.facebook.com/groupon.fr | |
| http://www.twitter.com/grouponfrance | |
| Website | http://www.groupon.com/ |
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