Why would they do the thing they do on the box, the website, in a little packet, and over the phone?..

I think I should explain. A post is the main, original content that someone uploads to the internet for others to reply to, supplying a separate space, called a comment section, for people to discuss. It can be a picture, text, link, or some combination of the three.

A comment, despite being able to hold the same content, is not a post as it is not the main, original content someone posted. A comment does not create a separate space, but it does create a comment thread, a string of replies, usually by separate users.

A comment is to a post as the red marks on your school papers were to your writings. Hope that helps!