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PR Exec Apologizes for Offensive AIDS Tweet

Justine Sacco was fired after a tweet she sent before getting on a plane for Africa.
3:00 | 12/23/13

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Transcript for PR Exec Apologizes for Offensive AIDS Tweet
We turn to the latest on the fire storm erupted online after a p.R. Executive tweeted about her upcoming trip to africa. She didn't know she was fired until she landed. Reporter: Good morning, lara. She was the high-level pr executive called a racist after posting the tweet before getting on a plane. In the air, unaware she was about to get hired. This morning, justine sacco, who worked with ok cupid and the daily beast. Her tweet -- going the africa. Hope I don't get aids. Just kidding. I'm white. Now she says words cannot express how sorry I am, and how necessary it is for me to apologize to the people of south africa. She posted it on friday. She was offline for the nearly 12-hour flight. The whole time, millions were online, an explosive reaction. Her reputation imploding. That hash tag, has justine landed yet seemed to appear everywhere. This is one of the fastest responses and crash and burns i have ever seen from a tweet. It's amazing how her life changed in the course of one flight. Reporter: This photo reportedly shows her on the phone, apparently learning of the uproar for the first time. She deleted the tweet and then the entire account. That is a start. It doesn't go far enough to repair the damage she's done. Reporter: She sent a statement to "gma" telling us it is terribly easy to be cavalier about an epidemic one has never seen. Her family reacting, too, saying this is not indicative of the type of person she is. She wasn't raised this way. It was just a comment she made and she and her farmly are devastated. She tells us she was born if south africa, calling it her father's country. Sparking more criticism that she should have known better. A lawsuit from u.S. Navy sailors called to action in

This transcript has been automatically generated and may not be 100% accurate.

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