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12th July 2017
10:54pm BST

There has been no confirmation that the button serves this purpose yet and tapping the button at the moment just captures the screen and saves the file to the camera roll.
As well as YouTube, Facebook and Twitter have made live video a big part of their companies strategy and it has proved very well.
The video below was posted by Everything Apple Pro who have over 4 million subscribers and conduct reviews of the latest Apple products. So, if anyone is going to have a rough idea of what the button could be for, it's going to be them.
From about 3:00 onwards, they begin to talk about the new Start Broadcasting button.
https://www.youtube.com/watch?v=jB2ch1O0IIA
Clip via EverythingApplePro