No mention of how they measured this, except this: "That's according to new Hitwise data based on Web-based traffic, but excluding mobile and app-specific traf

No mention of how they measured this, except this: "That's according to new Hitwise data based on Web-based traffic, but excluding mobile and app-specific traffic." Groupon has lots of mobile apps: http://www.groupon.com/mobile http://www.groupon.com/mobile