commenter
A person was makes witty comments may be called a wit. (Note that wit is also an abstract noun).
Additional comments ideas on a reference
A Critic
There are many answers to that. They are indicated by a red triangle in the cell. They are pieces of text to give you some information about the cell. They are normally hidden until you put the cursor over the cell.
a person who makes rude comments,puts you down.
a person that makes really wrong comments
depression.
Some blogs let the person making the comment edit their own comments. Other just allow the owner of the blog to edit comments.
There is no way of blocking Twitcam comments that appear on your Twitter timeline. The only way to stop Twitcam comments would be to unfollow or block the person tweeting the comments.
comments
Roboto
The tone of a person's comments would be wistful if it shows melancholy. The tone of a person's comments would be wrathful if it is vehemently angry.