Facebook promotes “flagrant displays of bulls***” and is “delusional” to believe people will trust it with their money, US senators said on Tuesday at a hearing about the firm’s plan to launch its own cryptocurrency.

David Marcus, the vice president of the tech giant’s messaging products unit, faced questions at a hearing on Capitol Hill about how the social media company would address privacy concerns about its proposed Libra currency, as well as how it will fit in with the current financial system.

Senator John Kennedy levelled a number of questions at Mr Marcus that referred to the company’s track record when it comes to user privacy – not least from the Cambridge Analytica scandal that saw user data manipulated by third parties for the purpose of political profiling and voter manipulation.

“Isn’t it true that Facebook has chosen to advance a set of values in which truthful reporting has been displaced by flagrant displays of bulls***?” the Republican senator asked.

Mr Marcus replied: “I don’t know how to answer that question.”

Senator Kennedy then sarcastically responded: “Facebook now wants to control the money supply. What could possibly go wrong?”

Facebook birthday: 15 defining moments for the social network Show all 15 1 /15 Facebook birthday: 15 defining moments for the social network Facebook birthday: 15 defining moments for the social network Facebook is born On 4 Feb, 2004, 19-year-old Harvard student Mark Zuckerberg launched a website called 'TheFacebook' from his dorm. Within 24 hours the college social network had more than 1,000 users Wikimedia Commons Facebook birthday: 15 defining moments for the social network Winklevoss twins sue Zuckerberg Within one week of launching, fellow Harvard students Cameron Winklevoss, Tyler Winklevoss and Divya Narendra accused Zuckerberg of stealing their idea. It would be four years later when the resulting lawsuit was finally settled Facebook birthday: 15 defining moments for the social network Open for business The social network finally opened it platform to everyone on 26 September, 2006. The move proved the catalyst in supercharging the site's already explosive growth PA Facebook birthday: 15 defining moments for the social network Billion-dollar bid Yahoo offered $1 billion to buy Facebook in September 2006 but Zuckerberg turned it down. 'I don’t know what I could do with the money,' Zuckerberg reportedly said. 'I’d just start another social networking site' Reuters Facebook birthday: 15 defining moments for the social network In the money In September 2009, almost five years since the site launched, Facebook turned a profit for the first time Getty Images/iStockphoto Facebook birthday: 15 defining moments for the social network Taking the lead Facebook overtook MySpace in 2010 to become the world’s most popular social network Facebook birthday: 15 defining moments for the social network Taking on the tech giants In 2011, Google launched its own social network that it hoped would knock Facebook from its perch. Despite its initial success, Google+ ultimately failed and will be shut down completely in 2019 Getty Facebook birthday: 15 defining moments for the social network Facebook goes public On 18 May, 2012, Facebook went public. The initial public offering raised $16 billion – the third largest in US history Facebook birthday: 15 defining moments for the social network Gobbling up the competition Facebook acquired Instagram in April 2012 for $1 billion, consolidating its position as the world's leading social network Reuters Facebook birthday: 15 defining moments for the social network One billion users On 4 October, 2012, Zuckerberg announced that Facebook had hit 1 billion users. 'If you’re reading this: thank you for giving me and my little team the honour of serving you,' he wrote in a blog post Getty Images Facebook birthday: 15 defining moments for the social network Expanding its empire In February 2014 Facebook acquired the messaging app WhatsApp for $19.3 billion REUTERS/Dado Ruvic Facebook birthday: 15 defining moments for the social network Two billion users In June 2017, Facebook passed the 2 billion user milestone REUTERS/Dado Ruvic Facebook birthday: 15 defining moments for the social network Privacy scandal On 17 March 2018, news broke that UK firm Cambridge Analytica had harvested data from around 87 million Facebook users for the purpose of political profiling in the build up to the 2016 US presidential elections Shutterstock Facebook birthday: 15 defining moments for the social network Record profits Despite the scandals and subsequent #DeleteFacebook campaign, Facebook posted record profits just before its 15th anniversary, the equivalent of $7.37 from each of its 2.32 billions users iStock/Independent Facebook birthday: 15 defining moments for the social network Unhappy users A study found that people are happier when they don’t use Facebook, adding to mounting evidence surrounding the impact social media has on mental health Rex Features

Facebook is fighting to get Washington onside after it shocked regulators and lawmakers with its announcement on 18 June that it was hoping to launch a new cryptocurrency called Libra in 2020.

Since then it has faced criticism from policymakers and financial watchdogs at home and abroad who fear widespread adoption of the digital currency by the social media giant’s 2.38bn users could upend the financial system.

“Facebook has demonstrated through scandal after scandal that it doesn’t deserve our trust,” Democratic senator Sherrod Brown, the ranking member of the Senate Banking Committee, said in his opening remarks. “We’d be crazy to give them a chance to let them experiment with people’s bank accounts.”

Mr Brown added during questioning that he thought it was “delusional” to think individuals would trust the social media company with their “hard-earned” money.

The Senate Banking Committee is questioning David Marcus, the company’s top executive overseeing the project, on issues ranging from how Libra could affect global monetary policy to how customer data will be handled.

Mr Marcus, the president of PayPal from 2012 to 2014, tried to assuage concerns in his opening remarks by promising that Facebook will not begin offering Libra until regulatory issues are addressed.

“We know we need to take the time to get this right,” said Mr Marcus, who is also due to testify before the House Financial Services Committee on Wednesday, said.

Facebook CEO Mark Zuckerberg is leaping into the world of cryptocurrency with Libra, designed to let people save, send or spend money as easily as firing off text messages (AFP/Getty Images)

Mr Marcus received a frosty welcome from Democratic representatives, who already believe the company is too large and careless with consumer data.

Concerns raised through questions included how the company plans to prevent money laundering through the new payment system, how consumers’ data and funds will be protected and how the Geneva-based association created to run the system will be regulated.

Republicans shared some of these worries, but appeared less hostile, even after president Donald Trump and treasury secretary Steven Mnuchin voiced concerns over the past few days.

“They’re going to have to convince us of very high standards before they have access to the US financial system,” Mnuchin said on Monday.

Critics have expressed anger that the company would have got so far in its plans for such a potentially groundbreaking project without extensive input from policymakers, especially when it is already in the spotlight over privacy issues.

Facebook allocated a small fraction of its vast workforce to work on the project, Kevin Weil, who runs product for the Libra initiative, told Reuters last month.

One former employee told Reuters the company tried to keep the project under wraps even internally – staff who were not involved knew little about it, not even that it was operating under the name Libra.

Libra describes itself as a ‘simple global currency and financial infrastructure that can empower billions of people’ (Libra/ iStock/ The Independent)

Rumours had surfaced as early as last year that Facebook was working on a digital currency, but news that the project was in its advanced stages started to emerge only in recent months.

In the weeks leading up to the announcement, the company began reaching out formally to key regulators including the Federal Reserve, the Treasury and the Commodity Futures Trading Commission. But two people with knowledge of the discussions said the conversations remained vague, with key details of the project discussed only on a theoretical level.

Some lawmakers specialising in financial services policy have been frustrated by the lack of clarity from Facebook before and since in recent months, three congressional sources said.

Top Republican and Democrat on the Senate Banking Committee had sent Facebook a letter in May seeking information, including how the company would protect consumers’ financial information. But Facebook did not write back until 8 July, the committee said.

One Democratic aide described the company’s contacts with lawmakers as “inept and entitled.”

Facebook has said that it announced the project in its early stages to get feedback from stakeholders. Mr Marcus reiterated this at the hearing on Tuesday.

The executive added: “I know that we will have to earn people’s trust for a very long period of time to get the benefit of them wanting to use the Calibra wallet.”