Facebook Messenger is adding a feature that, if you didn't use it, you would expect to already have. With today's addition of video chat capability, it has parity with the desktop chat interface that has long supported this. As a server-side switch, you should have this available so long as you are using a reasonably new version of the app.

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As you see in the image above, there is a camera icon at the top of the conversation that will initiate the video chat.

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