Creating a social media policy is absolutely necessary in today’s workplace. Learn what every employer should know about the law and social media. In 2013, Justine Sacco, a thirty-year-old senior director of corporate communications at the media and Internet giant IAC, boarded a plane from New York to South Africa. Along the way, she tweeted a few mean jokes, then on a layover in Heathrow, tweeted: “Going to Africa. Hope I don’t get AIDS. Just kidding.