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To commemorate those lost in the September 11, 2001 attacks that occurred 11 years ago on Tuesday, many Twitter users spent the morning sharing details about where they were when they first heard the fateful news.
[View the story "Twitter Users Remember Where They Were During 9/11" on Storify]
Where were you when you first heard the news? How might social media have changed that day? Share your thoughts in the comments.
Image courtesy of iStockphoto, rabbit75_ist