Mark Zuckerberg makes veiled attack on Donald Trump - video

Facebook founder Mark Zuckerberg spoke out against Donald Trump's anti-immigration comments during an annual developer conference on Tuesday. Zuckerberg said he was alarmed by a shift in many countries towards people looking inwards, saying he heard 'fearful voices calling for building walls' and halting immigration. 'It takes courage to choose hope over fear,' Zuckerberg told the crowd