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Wall Street ended lower after US President Donald Trump said he was not pleased with the recent US-China trade talks, and also raised doubts about the upcoming North Korea summit.
The Dow Jones fell 0.7% to 24,834.41 points, while the S&P 500 shed 0.3% to 2,724.44.
The Nasdaq slipped 0.2% to 7,378.46.
- Copyright: Reuters
US President Donald Trump has floated a plan to fine ZTE and shake up its management as his administration considered rolling back more severe penalties that have crippled the Chinese mobile phone company.
Trump's proposal ran into immediate resistance in Congress, where Republicans and Democrats accused the president of bending to pressure from Beijing to ease up on a company that has admitted to violating sanctions on Iran.
Their reaction could complicate Trump's efforts to win concessions from China that would narrow a $335bn annual trade gap.
Speaking at the White House, Trump said US technology companies have been hurt by an April Commerce Department decision that prohibits them from selling components to China's second-largest telecommunications equipment maker.
ZTE shut down most of its production after the ruling was announced. "They can pay a big price without necessarily damaging all of these American companies," Trump said.
Veteran Euro politician and one of the MEPs quizzing the Facebook chief has tweeted his verdict on the proceedings.
- Copyright: Getty Images
A former Uber engineer is suing the firm for sexual harassment days after it changed its policy allowing employees to take it to court.
Ex-employee Ingrid Avendano claims to have experienced sexual harassment, pay inequity and racial discrimination while working at Uber.
The new policy, introduced last week, overhauls the way Uber addresses US sexual harassment and assault claims.
News site Recode first reported Ms Avendano's claims.
Ms Avendano, who worked for the firm from February 2014 to June 2017, filed her lawsuit on Monday in the California Superior Court.
In the lawsuit she claims, that during her whole time at Uber "she saw and experienced a male-dominated work culture, permeated with degrading, marginalising, discriminatory, and sexually harassing conduct towards women".
Wall Street gave up earlier gains after US President Donald Trump said he was not pleased with the recent US-China trade talks, and also raised doubts about the upcoming North Korea summit.
The Dow Jones drifted 0.4% lower to 24,904 points, while the S&P was virtually flat at 2,731. The Nasdaq just held its head above water, up 0.05% at 7,97.7.
The Serious Fraud Office has brought additional charges against two men who have been charged with conspiracy to give corrupt payments to secure the award of a contract worth $733m (£544.9m) to Leighton Contractors Singapore PTE Ltd for a project to build two oil pipelines in southern Iraq.
Basil Al Jarah has been charged with with two offences of conspiracy to give corrupt payments and Ziad Akle was charged with one offence.
They will appear before Westminster Magistrates’ Court on 23 May.
The sitting ends with Mr Zuckerberg pledging to follow up on other issues that he has not addressed in his closing speech.
This prompts some grumbling from Belgian MEP Philippe Lamberts, who says Mr Zuckerberg did not properly answer his questions.
"You asked for this format for a reason," he says.
Mr Zuckerberg says he will "make sure" the MEP gets answers to his questions.
Guy Verhofstadt also says there are more questions he wants answers to.
On whether the Cambridge Analytica scandal is simply the "tip of the iceberg" on data issues, Mark Zuckerberg says changes to Facebook's privacy settings mean an app would no longer be able to have access to "that level of data".
The company is in the process of reviewing apps that operated under previous rules, a process which he says may take "many months".
"I do anticipate that there are going to be other apps that we find that we are going to want to take down," he adds.
Guaranteeing the integrity of elections in Europe is a "top priority" for Facebook, Mark Zuckerberg continues.
There is no question about whether there should be regulation, he says, but the important thing is "to get this right".
This is an "ongoing conversation", he tells MEPs.
On issues raised relating to competition, he says that communication is a "competitive space" where people have "many choices".
"It feels like there are new competitors coming up every day," he notes.
Mr Zuckerberg says Facebook removed around 580m fake accounts in the first quarter of this year.
Most of these were removed "within minutes" of being registered, he tells MEPs.
On the issue of fake news, he says the company does not want to deciding "what is true or false", and therefore works with third-party fact checkers to identify false articles.
News articles identified as "provably false" by a number of fact-checkers are altered to add more related content so people can have a "more rounded view", he says.
He adds that this is an area where there is "a lot more to do".
Now it's time for Mark Zuckerberg to respond to the very lengthy list of questions put to him by MEPs.
On removing content, he says Facebook is developing AI tools that should allow more content to be removed "upfront".
As a "big company", Facebook can now afford to employ tens of thousands of people to remove content, he adds.
He also specifies the firm's AI systems can flag 99% of "ISIS and al-Qaeda related content" that is taken down before it is flagged by users.
German Green MEP Jan Philipp Albrecht, who was the European Parliament's negotiator on the new GDPR data rules, says he welcomes that Facebook will apply the rules globally.
He asks for a pledge that Facebook will not use data collected for security reasons for other purposes such as political advertising.
He also asks whether there will be any exchange in future of user data between Facebook and WhatsApp, the messaging service it acquired in 2014.
Labour MEP Claude Moraes, who chairs the assembly's civil liberties committee, starts off by saying his committee will be conducting more in-depth hearings on the subject than today's meeting.
He says there is a "very obvious" gap between data privacy standards in Europe and in the United States. The gap "must be closed", he adds.
He asks what measures will be taken to ensure a thorough analysis of apps that are given access to Facebook data.
Former UKIP leader Nigel Farage says he is Facebook's "best client" at the European Parliament.
The Brexit vote and Trump's election as US president would never have happened without social media allowing people to "get round the back of mainstream media", he observes.
However, he says that a change to the company's algorithms in January has led to a drop in views and engagements for those with "right of centre" political opinions.
"On average, we're down about 25% over the course of this year," he adds. He asks who should decide what is acceptable on the site.
The Facebook boss says that in the first three months of 2018 the company took down 580 million fake accounts, the vast majority within minutes of being registered. Preventing interference in elections "is one of our top priorities," he tells the MEPs.
- Copyright: EBS
Guy Verhofstadt, who leads the Liberal ALDE group, says the activity of fictional social media company the Circle in a 2014 novel seems "very near to the reality" of Facebook's role today.
He asks Mr Zuckerberg whether he is capable of fixing problems at the company.
He says that even as a liberal, he supports "public regulation", instead of letting social media companies self-regulate.
He likens the situation to regulation of the banks in the financial sector.
In opening remarks, German MEP Udo Bullman, the leader of the Socialist and Democrat group, says he wants to know whether Facebook is "completely ready" for the entry into force of the EU's new data rules.
He asks whether the company can pledge not to not sell data without "proper consent".
He also asks Mr Zuckerberg whether he can "guarantee" that there will not be foreign interference on the platform in next year's European Parliament elections.
Mr Bullman also says he wants to know the number of fake accounts Facebook has deleted this year.