'Collective buying power'
Groupon is a deal-of-the-day service that features discounted gift certificates usable at local or national companies. Groupon was launched in November 2008, and the first market for Groupon was Chicago, followed soon thereafter by Boston, New York City, and Toronto. By October 2010 Groupon served more than 150 markets in North America and 100 markets in Europe, Asia and South America andhad 35 million registered users. The idea for Groupon was created by Andrew Mason.