to write a comment that says the exact or similar thing as previous comment(s) instead of thumbing up or liking an existing comment.
John comment inflates a facebook post by posting a comment that says: "So sorry to hear!" after seeing a previous comment that says: "I'm so sorry to hear" (instead of thumbing up or liking that existing comment).
see also: comment inflator, comment inflation rate
contributed by: http://flower2fruit.blogspot.ca/2013/11/facebook-created-like-button-for-reason.html