Justine Sacco. Privileged as white and wealthy (although she probably denies the second part). Travelling to South Africa and makes a poor taste racist joke about AIDS on Twitter. It goes – and I hesitate to use this word because I detest its use in this context AND it’s a pun in another – viral. She’s mocke and villified. Her employer takes her name off their website. A person looks for her after her flight (which people look up and track with #HasJustineLandedYet added for searchable vigilanteism) lands and takes photos of her at the airport on her phone, perhaps hearing this news. This has turned from calling out someone’s racism into ruining her life, into harassment and stalking.