Rob Leathern, Facebook’s chief of advertising integrity who handled ad products around sensitive subjects, says he left the company on December 30 (Katie Paul/Reuters)

Katie Paul / Reuters:
Rob Leathern, Facebook’s chief of advertising integrity who handled ad products around sensitive subjects, says he left the company on December 30  —  (Reuters) – Facebook Inc’s chief of advertising integrity, who handled the company’s ad products around sensitive subjects such as politics …