Our own data. We collect, cleanse and analyze data from the local commerce industry. Our database contains about 3M deals which represent around $4B in consumer spending. We currently track about 260 deal sites in North America, including Groupon.
Our platform is continually monitoring the industry from a variety of sources. The reporting platform and API runs off a dimensionally modeled DB. The UI is pretty rough at this point, really just a MVP to demonstrate our data and the direction we are headed.