Facebook and Cisco are rolling out a free WiFi system for businesses. But here's the catch: to take advantage of this free Web surfing, consumers are required to check-in to whatever local business they are visiting via Facebook. Bonefish Grill is currently testing the program—dubbed CMX for Facebook—in two of its 158 restaurants, while conference center brand Evergreen Brickworks (video below) has implemented it as well, the companies said. For CEO Mark Zuckerberg's firm, the development should bolster its location data on users, potentially bettering ad targeting on the soci...