When you compose a new tweet in Twitter's official Android or iOS client, you now have an option of adding a photo, a video, or go live with Periscope.
If you don't have the Periscope app installed, you'll be prompted to download it. The feature is still not as prominent as it could be —
for example, Twitter could've placed it on the uppermost row of icons, together with location, media, GIFs and polls. Still, it's an obvious reaction to Facebook Live, which is fast taking a central place in the Facebook user experience.
The Twitter-owned Periscope app recently made some important changes as well, giving users the ability to save broadcasts in May.
The app will likely see a boost from its dedicated button in Twitter, giving it a better position to compete with Facebook Live.