Facebook made a mistake by favoring check-ins over deals in the design of their mobile apps. Before you can discover what deals are available you need to click on the "Check-In" button. You can then search for merchants that are within some hidden proximity of your current location. From there you have to go to each merchants place to see what deals they are offering.
This makes finding a deal you are interested in a huge pain because you need to jump from screen to screen to get an idea of the deals all the merchants in your area are offering. Deals should have been made a first class citizen with its own search screen so you can get a clear picture of what is being offered by all merchants in your area.
Overall Facebook Deals feels like something that was just tacked on to the side of Places.