WASHINGTON The revelation that British consulting firm Cambridge Analytica collected and maintained data on 50 million Facebook users to influence U.S. elections has prompted calls for oversight, investigation and possibly regulation of the social media giant.

Facebook founder Mark Zuckerberg made clear this week that he is open to the government regulating Facebook in some way. The question isnt, Should there be regulation or shouldnt there be? Its How do you do it? Zuckerberg told Wired.com .

Members of Congress signaled Thursday that they might be up to the challenge. The chairman of the committee with jurisdiction over the Federal Trade Commission, which could impose stricter regulations on Facebook, called for Zuckerberg to testify on Capitol Hill.

That will be the first step in gathering the facts, Rep. Greg Walden (R-Ore.), chairman of the House Energy and Commerce Committee, told HuffPost.

But its not clear if Zuckerberg will accept the invitation, and Walden and other lawmakers said theyre not sure what sort of regulations they would ultimately consider.