Did some local testing and noticed that if, for example, 3 people are following a blog post and someone leaves a comment, there are 5 Mongo documents created:
What happens if we had, again just for example, 15,000 users following a blog post...!
Version: AEM 6.2 with Communities FP1 & FP2SRP Config: Mongo DB SRP (MSRP)
Thank you so much for the reply, Dan. Makes a bit more sense after reading a couple articles on it.
For anyone else that may come across this post in the future, this is the article I found, and the links that it contains: