I just noticed that you can do a free check in offer on Yelp. I guess this shows up on their mobile site, and when someone comes in with this they can get the offer for checking in, which tells their friends etc that they are at your business. They also have a Yelp deal which is similar to a groupon, but has a 70/30 split. For those that felt like they made money from groupon, this might be a good deal to make sure they come to your shop instead of the someone else's. Has anyone else used these?