Facebook operating margins decline as costs surge, shares fall
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(Reuters) - Facebook Inc beat analysts' estimates for daily active users on Wednesday, but shares fell as operating margins dropped for the world's largest social network after it ramped up spending to improve content and security across its platforms.Shares were down 5% in extended trading.Total costs and expenses surged a higher-than-expected 34% to $12.22 billion (9.3 billion pounds) in the fourth quarter, dragging down operating margins to 42% from 46% a year earlier.Facebook has faced..