Add Some Gamification to Encourage Use & Engagement

## Is your feature request related to a problem?
One challenge nearly all sites have is to improve engagement, including encouraging comments from other visitors. I just noticed that [Dev.to](https://dev.to) uses gamification techniques to reward intended behavior. In this case, it's using a positive email and a badge.

## Describe the solution you'd like
Any features toward this end are welcome, but the least we could do is send a note to thank the visitor for their comment(s), and if we know it, send them a thank for you certain milestones.

Example from Dev.to:


## Describe alternatives you've considered
There are plenty in this realm. :)

## Additional context
N/A