INTERNATIONAL NEWS - Facebook CEO Mark Zuckerberg has told US senators his company is in a constant battle with Russian operators seeking to exploit the social network.
"This is an arms race. They're going to keep getting better," he said.
Mr Zuckerberg was answering questions in the wake of the Cambridge Analytica data collection scandal.
He also revealed Robert Mueller, the special counsel investigating alleged Russian meddling in the 2016 election, had interviewed Facebook staff.