A message on a Facebook post, which may contain text or a link to content elsewhere on the web. Comments appear below the Like count, under the post content.
Why do you need to understand Comments?
On Facebook, comments are one of the ways consumers can interact with your Page content. Comments show the brand that fans are actively listening and interested in adding their own feedback. Earning a higher level of engagement through comments and other social activity helps brands continue appearing in the Newsfeeds of their fans. See an example of a Facebook comment below: