Facebook has been putting a lot of resources into improving internet connectivity in rural areas. At first, that may seem like a distraction for the social networking giant, but Facebook takes its mission to connect people pretty literally. And to do so, it’s taking a building-block approach that involves lots of different projects that all attempt to solve different issues of this larger technology challenge. At its F8 conference in San Jose this week, Facebook once again moved these connectivity efforts into the spotlight. While the most exciting example of its work in this area is surely its giant, solar-powered Aquila drone (which actually hangs over the exhibit area at the conference), a lot of the work Facebook is doing here is in the networking technologies that connect the drone (or multiple drones) with the internet. That includes a project like Terragraph, which is meant for urban environments, as well as the likes of the OpenCellular project, a fully featured wireless a