Don't forget that Facebook owns Instagram as well. My non-tech friends (most of them) use exactly 2 apps regularly on their phones. Facebook and Instagram. I'm not sure any of them would jump at a Facebook branded phone, but I think a phone with Instagram in mind as the key feature (e.g. an awesome camera, integrated filters, not sure what else) might strike a chord with some of my friends.
EDIT: Almost forgot about Vine. That seemed to blow up in popularity in my demographic recently here in Hawaii. if Facebook owned Vine, they would have the holy trinity of apps.
EDIT: Almost forgot about Vine. That seemed to blow up in popularity in my demographic recently here in Hawaii. if Facebook owned Vine, they would have the holy trinity of apps.