>> now i get to obsess or see how many more people are going to buy it every 30 seconds by hitting the refresh button. >> reporter: by noon the tally is 57, by 2:00 p.m. it's 91, and when the deal closest atidnight the next day, sushi by simon has 109 new customers. >> even the service. >> when i saw, like, sushi on there, a sushi-making class, i have to take this class. >> we tried it on our own -- >> and we were not very w successful. it's a great way to learn. >> i have definitely gotten a huge uptick in other business interest. i have to imagine that it is due at least in some part to the visibility that i got from groupon. >> reporter: since launching in 20he08it has flourisd, and now the 60 million subscribers around the world. it's also spawned a swarm of competitors looking to cash in on the group-buying phenomenon. what sets groupon apart? >> were getting smarter using the right data to get the right deal in front of the right