Facebook did not immediately respond to a request for comment
It's the first time that the three wealthiest people on the ranking made their fortunes from technology
About 99% of Facebook's $40.6 billion revenue (2017) came from advertisements and it had 2017 profits of $15.9 bn
Facebook requires Zuckerberg to fly private as part of his security program, which was put in place to address threats arising directly as a result of his job as CEO
Facebook's board of directors believes that this investment in Mark's personal security is entirely justified
The hearings that ended on Wednesday revealed no consensus among US lawmakers about what kind of privacy legislation they might want to pursue, if any, and no timeline for action
Facebook CEO Mark Zuckerberg stumbled in answering a couple questions before US Senate's Commerce and Judiciary committees, but investors seemed happy
Zuckerberg says the solution is "to develop more AI tools." But in response to our reporting, the company promised to hire more human reviewers
With Cambridge Analytica scandal blown out of proportion, here is the full transcript of the hearing
This week, two high profile CEOs have issued public apologies on behalf of their corporations
The social-media giant's economic model emerged unscathed despite hours of questions from senators
Here is a collection of Zuckerberg's apologies, from the earliest to the most recent, in which he acknowledges mistakes and promises to do better
Facebook CEO Mark Zuckerberg began a two-day congressional inquisition today with a public apology for a privacy scandal that has roiled the social media giant he founded more than a decade ago. Zuckerberg opened his remarks before the Senate Commerce and Judiciary committees by taking responsibility for failing to prevent Cambridge Analytica, a data-mining firm affiliated with Donald Trump's presidential campaign, from gathering personal information from 87 million users to try to influence elections. Zuckerberg had apologized many times already, to users and the public, but this was the first time in his career that he had gone before Congress. He also is to testify Wednesday before the House Energy and Commerce Committee. In the hearings, Zuckerberg is not only trying to restore public trust in his company but also to stave off federal regulations that some lawmakers have floated. In his opening statement to senators, he also apologized for fake news, hate speech, a lack of data
The Facebook chief will be tested as he appears before Congress about privacy issues
Failure to comply with the law carries a maximum penalty of up to 4% of annual revenue
He said in a post on Facebook that the company "made mistakes, there's more to do, and we need to step up and do it"
The post, a reflection of the 14 years since Zuckerberg launched Facebook as a Harvard student, was the latest to acknowledge problems in the social network that has grown to some two billion users
Facebook and its social media competitors have been inundated by criticism that their products reinforce users' views on social and political issues
Chief executive has set annual personal challenge since 2009; in post, says company 'has made too many errors'
Zuckerberg referenced cryptocurrencies in a posting Thursday in which he laid out how he will spend 2018 trying to correct persistent problems