Zuckerberg down $16.8 billion in fortune

Facebook chief executive Mark Zuckerberg said the tech giant has been investing heavily in “safety, security and privacy” after being rocked by concerns of manipulation. Facebook shares went into a freefall 25 July as a stunningly weak financial outlook raised fresh concerns for the social networking giant as it tries to recover from the impact of data protection scandals and investigations. After-hours trade saw Facebook shares plunge by some 21%, wiping out an estimated $130 billion in market value if the slump is confirmed at 26 July market opening.