IAC's PR Chief Apparently Tweeted a Bizarrely Tasteless Joke About AIDS and Africa

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UPDATE 4: (3:56 p.m., Dec. 22): Justine Sacco has written a public apology, noting, "Words cannot express how sorry I am, and how necessary it is for me to apologize to the people of South Africa, who I have offended due to a needless and careless tweet."