The New York Times reports that Facebook may add a "dislike" button. I am with the many people (probably now all or mostly over 35) who use Facebook and have thought a dislike button would be a nice option.  

"Just had a car accident."  "Lovely dog just passed." "Kids barfing wildly."  Dislike. 

But I assume Facebook has skipped this for a reason. That is, it could be used in a terrible manner. 

"Proud to announce we're engaged." "Welcome to our new baby boy." "This is my new painting." Dislike. 

I understand the desire for symmetry, but dislike is probably not the button for a good experience with Facebook.  Maybe an "I'm sorry" or "That's too bad" button, would work better.  I don't know, but when I put this blog post on Facebook, a little part of me will be happy there's no dislike button.

Not that the lack of such a button ever stopped a snarky comment or six.