Well I have been buying a lot of these things lately. I eat out a lot, so I mostly just buy the ones for restaurants.
A few observations...
I can see how this could be a good advertising service for a new business. It creates awareness in a hurry. If you're an established business, I don't think this advertising method is too effective. If you're not making it, then losing a bunch of money to hit and run deal hunters isn't likely to help you pick up enough customers to turn it around. If you are making money, then why would you want to have your regular customers get used to the idea of deep discounts? For launching a new product out of an existing business, this could be useful because it plays to Groupon's strength. It can build awareness in a hurry.
Whether I get the deal from Groupon or Livingsocial or Facebook, doesn't matter to me, all it costs me is an email. I think there will be a lot of competition in this space. Margins are going to fall. If Facebook is smart, they will win.
I don't know if I am a typical user, but I am spending less total money than I otherwise would. The restaurants are attractive to me because that is something I already do and I would like to do it cheaper. I am not likely to sign up for a bunch of spa days because they are less expensive.
Also:
http://globaleconomicanalysis.blogsp...-in-japan.html