Facebook Inc on Wednesday said it appointed Nicola Mendelsohn as its new head of global business group to oversee the social media company's vast advertising business.

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Mendelsohn has filled the role on an interim basis since June, after the departure of former ads chief Carolyn Everson. She previously served as vice president of Europe, Middle East and Africa.

The news comes during a tumultuous period for Facebook, after a whistleblower testified before the US Senate last week that Instagram caused mental health harm to teens, and revealed she had leaked thousands of internal documents that served as the basis of a Wall Street Journal investigation.

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Facebook said Mendelsohn, currently based in London, will relocate to New York.

Also Read: US senator asks Facebook CEO Mark Zuckerberg to retain documents linked to testimony