The last tweet from U.S. Rep. Gabrielle Giffords said, "My 1st Congress on Your Corner starts now. Please stop by to let me know what is on your mind or tweet me later."
It sounded so innocuous.
Minutes later, mayhem broke out and Giffords was critically wounded by a shot to the head. Six people were killed, including federal judge John Roll, who had recently worked with Giffords on court issues. A total of 13 people were injured.
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