San Francisco — Facebook announced plans Tuesday to adapt to users sharing more privately as the leading social network pours money into an ongoing battle with "bad actors" out to misuse its service. Facebook reported that its quarterly profit climbed in the recently ended quarter, but the social network — mired in a spate of controversies — gained fewer users than analysts had expected. Profit beat Wall Street expectations by jumping 9% to $5.14bn on revenue that leapt 33% to $13.7bn in the quarter that ended September 30. Facebook shares went for a rollercoaster ride in after-market trades as executives disclosed quarterly earnings figures along with challenges and opportunities seen in shifting trends in user behaviour. Shares jumped, dove and then rose anew before staying on higher ground, up 3.1% to $150.80, on the Nasdaq early in the evening in New York. "Right now, the market is really nervous and it doesn't take much to move the stock," said analyst Rob Enderle of Enderle Gr...

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