Fired PR exec issues apology over AIDS tweet that exploded
                                
                                
                                    (Newser) -
                                    The not-so-PR-savvy former PR executive  behind the "tweet heard round the world"  is very and predictably sorry, reports  ABC . Justine Sacco has issued an apology—blessedly not via Twitter—saying, "Words cannot express how sorry I am, and how necessary it is for me to apologize to the...