How #thoughtsandprayers on Twitter shed light on gun debate

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Flags fly at half staff at the Capitol, in Sacramento, Calif., to honor the victims of a  mass shooting in San Bernardino, Calif.,  Wednesday, Dec. 2, 2015.  (AP Photo/Rich Pedroncelli) Flags fly at half staff at the Capitol, in Sacramento, Calif., to honor the victims of a mass shooting in San Bernardino, Calif., Wednesday, Dec. 2, 2015. (AP Photo/Rich Pedroncelli)