I've used a few Groupons, but I wonder if any of you know the overall scope of who is using which of these services. What's the difference between them? More shopping, more services, more restaurants or what? It must be big business (Google bought Groupon.)
My friend has a Bklyn-based tutoring business for kids and teens, and I was thinking it would be a good thing for the biz. But which offering service?
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