The moves follow sharp criticism of Facebook's handling of the 2016 presidential election, when it failed to restrict disinformation from Russian operatives.
CEOs Tim Cook of Apple, Jeff Bezos of Amazon, Mark Zuckerberg of Facebook and Sundar Pichai of Google were grilled for more than five hours.
Social media giants face attacks for allegedly using their dominance to stifle conservative views.
The antitrust hearing was called amid rising concerns over Big Tech dominance.
Other tech giants, including Google and Twitter, as well as rights groups have expressed concerns about the law.
Twitter on Tuesday targeted tweets in which the president said that mail-in voting would lead to fraud and a 'rigged election' in November.
For now, the social media group is rolling out a survey asking users about symptoms they might be experiencing related to COVID-19.
The discovery was reported and the database was no longer available by Thursday.
US lawmakers critical of Facebook stepped up their calls to revisit its policy, which exempts comments, paid ads on the platform from fact-checking.
Libra faces criticism from regulators, and reported warnings from the Group of Seven that it poses a threat to the global financial system.
Going by the frenzy on Twitter where Tesla and Space X CEO Elon Musk is solicited to join the cryptocurrency crowd, an impression builds up that Musk is on the cusp of joining the cryptocurrency industry.
A persistent group of stockholders will try again to unseat Mark Zuckerberg as Facebook CEO and chairman.
CEO Mark Zuckerberg's claimed intent to focus on privacy will be hard to execute, will not happen soon and does not address major concerns about the company's role in society.
This move would likely give the social network an even greater competitive advantage.
Zuckerberg said in an interview that offensive content isn't necessarily banned unless it is to organize harm or attack someone.
Facebook could soon hold more data on its users than any government.
Mark Zuckerberg will face a public grilling over Cambridge Analytica data scandal at the European Parliament.
Facebook suspends apps pending 'thorough investigation' following the Cambridge Analytica revelations
Facebook CEO Mark Zuckerberg said the new dating feature is "not just for hookups" but to build "meaningful, long-term relationships."
The comments from the Facebook CEO came Wednesday, the second day of his two-day congressional testimony.
Mark Zuckerberg, the CEO of Facebook, appeared before the U.S. Senate on Tuesday for questioning by lawmakers.
Not content with nabbing the idea of "Stories" in the first place, Instagram is now trialling alerts for screenshots.