Want to livestream for your Twitter audience? You don't have to switch apps to get started. As promised, Twitter's Periscope button is now available to everyone using its Android and iOS apps. When you're starting a new tweet, you can tap a "live" button in the media picker to hop over to Periscope (it'll offer a download if you don't already have the app) and start broadcasting. This is more about exposing newcomers to Periscope than catering to veterans, but it's still handy if you thrive on Twitter and want a quicker path to live video.