Vidpresso is one of our favorite tools for live and interactive graphics on Facebook Live. They boast major clients including NBC and Buzzfeed. Vidpresso is great at bringing in comments, polls, lower thirds, full-screens, and more - all with your custom branding. It also has a video calling feature that works great to bring on guests. This is all much more fluid and built out than any other service I've worked with so far.
If you want to learn more about Vidpresso, email firstname.lastname@example.org