Do you think the blog maketh the blogger? Can you make a reading into the personality of a blogger through their blog? How much of the blogger is revealed to the reader when they read the blog?
So give it a shot. Read the blog of the person who commented before you and reveal his/her personality. In a world where the destiny and character is found in the creases of ones palm, the chances of you hitting the right notes by studying an experssion is very high...or is it?
Go on...be the soothsayer