The app is also poised to come to Amazon's Fire TV, Chromecast and other devices, so don't fret if you don't live in Apple's ecosystem. However, you may have to get used to ads. The current experience is blissfully ad-free, but you may well see mid-roll promos in the future as Facebook makes a push toward longer, higher-quality (and thus more profitable) videos. And the app could be particularly important for Facebook's live video ambitions now that it's hoping to broadcast sports and other content that benefits from TV-sized viewing. In short, this could just be the start of something much bigger.