Since you’re in at least one Facebook Group and are on social media, I’ll skip the part where I tell you what a comment is from scratch. It’s exactly what it sounds like—people can comment on your site’s posts while on your site, not just through social media. These are handled a few different ways. WordPress has a system you can use as a default, or there are options to use Facebook Comments or Disqus instead (which allow visitors to sign in on other places and keep track of responses). Trackbacks and Pingbacks, however, you may not have heard of. WordPress has this fun feature where, if you link to another article in your post it sends a little message to that link if it can in the form of an automatically generated comment, just letting them know their piece has been linked to. These are called Pingbacks whether you’re sending or receiving, and they work between WordPress blogs and installations. Trackbacks are the same general idea except that you send and receive them manually. These are for non-WordPress blogs and involve going to the article you’re linking to, copying the Trackback URI found above the comments section and pasting it into the Trackbacks section on your post screen in WordPress before you click Publish. They’re both worth keeping tabs on because it’ll let you know who’s talking about you online (so you can hop in and say thanks/comment on their article), but it’s a more personal choice whether you decide to display them. I’ve seen it handled on sites where they’re not displayed at all, where Trackbacks and Pingbacks have an individual section above or below the user generated comments, and where they’re just mixed through the regular comments.