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A team of European law-enforcement officials was hot on the trail of a potential terror plot in October, fearing an attack during Christmas season, when their keyhole into a suspect’s phone went dark. WhatsApp, Facebook Inc. ’s popular…

The UK should consider tougher rules for online giants such as Google and Facebook, a UK competition regulator has said. The firms' dominance in digital advertising is squeezing publications and newspapers, the Competition and Markets…