LONDON (AP) — European Union and British regulators have opened dual antitrust investigations into into whether Facebook distorts competition in the classified advertising market by using data to compete unfairly against rival services. The coordinated effort represents an escalation by European regulators in their battle to rein in the dominance of big tech companies. EU officials said they’re looking into whether Facebook’s “vast troves of data” on user activity give it an undue advantage. The U.K. competition watchdog said its investigation includes Facebook’s online dating service. Facebook said it “will cooperate fully with the investigations to demonstrate that they are without merit.”