Mark Zuckerberg Takes A Dig At Donald Trump During Facebook Speech

Facebook CEO Mark Zuckerberg criticized Donald Trump and his anti-immigrant rhetoric with a thinly veiled reference to the Republican presidential contender during a speech to lay out his vision for the social media giant's future. 

"I hear fearful voices for building walls," Zuckerberg said in his keynote address to the Facebook Developer Conference on Tuesday. "Instead of building walls, we should build bridges."