A Facebook spokesperson told VentureBeat.
People are coming online at a staggering rate in emerging markets and, in most cases, are doing so on mobile. We’re continuing to improve Facebook so it works seamlessly and easily for people in all parts of the world, regardless of their device. We’ve heard feedback that in markets like India, mobile data and internet connectivity is limited and many people struggle with poor video experiences. So we’re testing an option for people to download videos to Facebook while they’re online on good internet connections, to view the video at anytime, online or offline, without using extra mobile data.