Facebook is one of the most active companies in trying to connect “the next billion” to the Internet, and so open up new markets for its services and advertisers. Increasingly, those new connections will be wireless, and so WiFi and cellular expansion are both critical to the company’s ambitions. Its latest move to make it easier to connect to the Internet is a new partnership program called Express WiFi Certified, which allows WiFi access point vendors to build hardware compatible with Express WiFi. The initial certified partners are Arista, Cambium Networks and Ruckus Networks. The initiative has strong resemblances to the WiFi Alliance’s WiFi Certified branding, but is specific to Facebook. This is the latest attempt by a major company…