The feature is called Instant Videos, and it works by automatically downloading videos when there is a Wi-Fi connection available so they can be watched later without having to use a data connection.
Facebook doesn't want you to burn through your mobile data plan just to keep watching its videos.
The "Instant Video" would be similar to Facebook's hosted content format - "Instant Articles" that loads faster than mobile websites so users. The feature will let mobile users watch Facebook videos when network conditions are appalling.
Facebook has yet to reveal how it will choose videos for offline caching.
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Instant Videos appear to serve a few different purposes. Look for videos with a lightning bolt.
It is however not clear that how the company will determine to download a video whether the company will download the video without the consent of the user or will it ask the user for the permission. This would certainly cause a lot of headaches for users who may only have 16GB of storage on their phones.
Instant Videos could help Facebook skirt spotty cellular networks. If Facebook decides to roll out its Watch tab more widely, it would certainly be more attractive to a global audience if it supports this new Instant Videos feature. The Wall Street Journal reported last week that Facebook is considering to spend as much as $1 billion in 2018 for its own original video content.