Hi!
What is considered shouting on the internet is when WHEN YOU TYPE IN ALL CAPS LIKE THIS!!! Doing this seems to make the words appear louder and more prominent. You can also add more emphasis to ALL CAP words by adding ***ASTERISKS***.
In the scenario in which Derek Miller's social media post is different than most since Miller had his family and friends write a post after he died with the letter he wrote. Hope this is the answer and would be of help.
