Mark Zuckerberg is about to face down US lawmakers, in a Congress hearing that could make or break Facebook.

But the most likely consequence is that nothing much at all will happen, senior politicians who are taking part in the hearings have warned.

The questioning before Congress has been built up in a range of reports, but the tone of politicians actually involved in them is far softer. One of the most senior politicians involved in quizzing Mr Zuckerberg referred to him as a "very nice young man", ahead of the hearings.

Mr Zuckerberg is making an appearance in large part to try and ensure that the US Congress and other regulators don't propose new regulations on internet-based companies likes his own Facebook.

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Many have called for such regulations after it emerged that the site had been giving data on its users to political advertising firms, without their knowledge. But it is unlikely that anything will actually happen, despite the widespread anger – in part because the issues are so complex.

Zuckerberg is scheduled to testify before a joint hearing of the Senate Commerce and Judiciary Committees.

He is confronting combined outrage over how Russia used Facebook to spread divisive political propaganda during the 2016 U.S. presidential election and how Facebook seemed unaware that a political consultancy, Cambridge Analytica, improperly harvested personal data of about 87 million Facebook users, most of them Americans.

Senator Bill Nelson, the top Democrat on the Senate Commerce Committee, said on Monday that while he believed new regulation was needed in the face of Facebook's twin scandals, he did not expect anything substantive to happen.

He attributed that in part to the format for Tuesday's joint hearing before the Senate's Commerce and Judiciary committees that will give Zuckerberg an advantage, saying it would favor spectacle over thoughtful dialogue.

"How in the world can you have 44 senators do a hearing that has a lot of substance when each senator only has four minutes?" Nelson asked reporters on Monday.

Senator Dianne Feinstein, the top Democrat on the Judiciary Committee, told reporters after speaking with 33-year-old Zuckerberg, that he "was a very nice young man" who "obviously knows what he's doing and has a very pleasant personality."

PRIVACY ADVOCATES OUTNUMBERED

White House Press Secretary Sarah Sanders declined to say on Monday if new regulations were needed. âI don't have a specific policy announcement on that front, but I think we're all looking forward to that testimony.â

Republicans are generally against more corporate regulation and they are not persuaded that tech companies need more of it. âI donât want to hurt Facebook. I donât want to regulate them half to death,â said Republican Senator John Kennedy of Louisiana, a member of the Judiciary Committee âBut we have a problem. Our promised digital utopia has minefields in it.â

Companies that have been victimized by computer hacks have been accused by lawmakers of failing to take adequate security measures to protect their customers' personal information.

Senior executives from a host of companies including Target Corp, Alphabet's Google, United Airlines and Equifax, have testified before Congress on a variety of issues including network security and walked away with little more than a scolding and a temporary dip in stock price.

Powerful lobbying forces assemble against any effort to convert public and political outrage into regulation, privacy advocates have said. Facebook spent $1.35 million on lobbying in 2011 and six years later spent $11.5 million, according to data maintained by the Center for Responsive Politics.

"People have this idea that we are going to pass omnibus privacy legislation and it is going to be a silver bullet," said Alvaro Bedoya, a former congressional aide who worked on privacy issues for former Senator Al Franken. "The reality is lobbyists outnumber consumer privacy advocates in Washington 20 to 1 or 30 to 1."

Instead of major regulatory changes, lawmakers in Congress have offered narrowly focused legislation.

The Honest Ads Act, for instance, aims to address concerns about foreign nationals covertly purchasing ads on social media to influence American politics. It would require political ads on the internet to reveal who paid for them, much the same as ads on television and radio. It legislation has been stalled since its introduction last October, although Facebook endorsed it on Friday.

Congress did pass legislation last month that chipped away at the 1996 Communications Decency Act, which for decades has guarded internet-based companies from liability for what users post on their platforms.

The legislation, which is expected to be signed into law this week by U.S. President Donald Trump, was aimed at penalizing operators of websites that facilitate online sex trafficking. Internet companies have expressed worry that it could be the first step toward dismantling decades of a hands-off regulatory approach by Washington.

Technology industry officials said they also expected Zuckerberg's testimony to be long on political point scoring and short on legislative ideas.

"They don't understand ad targeting and they will probably ask him a bunch of unrelated questions that play to their respective political bases," said one technology industry source, who spoke on condition on anonymity because his company had not authorized him to speak on the matter for the record.

"So Democrats will ask about monopolies and Republicans will ask about anti-conservative bias in Silicon Valley."