Mark Zuckerberg speaks at Disrupt

Facebook's founder speaks for the first time on stage since the company's IPO

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Islamic State issues video of beheading of U.S. hostage

DUBAI - The Islamic State militant group released a video on Tuesday purporting to show the beheading of a second American hostage, journalist Steven Sotloff, raising the stakes in its confrontation with Washington over U.S. air strikes in Iraq. | Video