Currently, during a YouTube or Facebook live streaming event, I must run my browser on a second monitor to see and respond to user comments. StreamYard, vMix and Ecamm provide this functionality. With the magnificent work from the development team on version 8, I hope and suggest that being able to put comments on screen during your live stream be made a high priority for the next upgrade.
UPDATE: I have found that I can include live streaming comments by using a third party Chrome browser extension named Social Stream Ninja by Steve Sequin. See https://github.com/steveseguin/social_stream