Smart Relationships: What is a quality blog comment?

https://docs.google.com/presentation/d/e/2PACX-1vRCquSDM-PCvz-wYtjOLxxw2vcFFNRzN2hViRiqagaODKGLHGnQK03_EuXxGHaXx9jfJWZycxwW5ykQ/pub?start=true&loop=true&delayms=5000
This is what we've learnt in our class.