Twitter had been testing a live streaming button for limited android users recently. And now twitter haas made that option available to all iOS and Android users.
Now When you're starting a new tweet, you can tap a "live" button in the media picker to hop over to Periscope and start broadcasting. You should have the periscope app installed already for this option to work, otherwise on clicking on the button you will be redirected to periscope download page in your app store or play store
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