Utilize the input text as a context reference, choose the right relationship between Sheryl Sandberg and Chief Operating Officer from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

SAN FRANCISCO, July 6 (Reuters) - Facebook Inc's Chief Operating Officer Sheryl Sandberg is taking a seat on the board of SurveyMonkey, the online polling company that was run by her late husband, Dave Goldberg.

Answer: position_held