SAN FRANCISCO, United States (AFP) — Facebook said Thursday its chief product officer Chris Cox was leaving the company, becoming the highest-ranking executive to depart amid the turmoil at the leading social network. Cox made his announcement in on his Facebook page, saying he was leaving “with great sadness” after 13 years. While Cox gave no specific reason for his move, he noted that Facebook chief Mark Zuckerberg has unveiled a new direction away from […]