henry copeland: Tone-deaf ad agencies beware: pllqt.it/UEFec3Summer's Eve's sassy black talking vagina; Pine-Sol's subservient cleaning lady; Popeyes Southern sounding "Chicken Queen" and countless others. I am certain most of them were done innocently enough. And many of you reading this may not even be aware that these efforts rubbed people the wrong way. But today's social-media landscape lends itself to hearty and mercurial retribution. Two words: Black Twitter.