From CNN
When asked by Democratic Sen. Patrick Leahy while he testified on Capitol Hill whether Facebook had been served subpoenas for the special counsel, Zuckerberg responded "yes," but later clarified: "I am actually not aware of a subpoena. I'm aware that there may be, but we are working with them."
Mueller is popping up all over the place these days! So what do you think his aim is with FB? Finding the source of funding for all those ads and the fake news stories? Or maybe a connection with CA?
Zuckerberg didn’t get that far into what’s been happening, he said he hadn’t been interviewed but he was worried he was saying too much in an open hearing
He continued: "I want to be careful here because our work with the special counsel is confidential and I want to make sure that in an open session I'm not revealing something that is confidential."
CNN