Facebook introduced video calling into Messenger back in April, and now it says that the feature has been rolled out almost entirely across the globe. There are still a "few countries" where Facebook says that it's holding the feature's release in order to improve video quality — it's likely that has to do with the speed of mobile networks in the area, since Facebook is trying to make this work well even when callers aren't on Wi-Fi. The announcement still marks a big expansion for Messenger's video calling, which initially launched in only 18 countries. It's available on iOS and Android.
Facebook has been giving Messenger a lot of attention lately. Though it's a core part of Facebook itself, Facebook also positions it as one of its biggest additional platforms, with over 600 million monthly active users. Video is a pretty basic and expected feature of chat apps by now, but it still offers Messenger an additional way to grow and keep people engaged. Facebook's bigger bets are around turning Messenger into a platform, including allowing apps to live inside of it. They're off to a slow start, but Facebook is now said to be looking into bringing games inside of Messenger as a way to get people coming back to it even more.