San Francisco( CNN Business) Facebook executive Sheryl Sandberg asked for information aboutbillionaire George Soros and his financial interest in the company's stock, Facebook has confirmed.

Sandberg had initially denied any knowledge of Facebook's relationship with Definers Public Affairs, a conservative PR firm hired by the company to do opposition research. Then, on thenight before Thanksgiving, she made a post on Facebook acknowledging that she knew about some of its work.

Definers circulated information on Soros earlier this year, which attempted to connect him to groups pushing for more regulation of Facebook, according to a New York Times report. Facebook severed ties with the firm two weeks ago, following thatstory.