https://www.cnet.com/news/mark-zuckerberg-in-capitol-hill-hearing-says-facebook-has-talked-to-special-prosecutor-mueller/

Facebook has talked to special prosecutor Robert Mueller, CEO Mark Zuckerberg said Tuesday during a hearing on Capitol Hill.

During questioning by Sen. Patrick Leahy, a Democrat from Vermont, Zuckerberg said that someone at his company has spoken with Mueller, though he himself hasn't. He declined to give more information, saying he wasn't sure what he could share in an open session. Zuckerberg also wasn't sure about whether Facebook has received a subpoena.