Democratic presidential candidates Elizabeth Warren and Joe Biden are sounding off on Facebook CEO Mark Zuckerberg following Zuckerberg's speech on freedom of expression at Georgetown University on Thursday.

During the 35-minute address, Zuckerberg described Facebook's approach to protecting free speech on the social media platform, which includes allowing paid political advertisements with misinformation.

Biden's campaign accused Zuckerberg of "feigned concern" for free speech and said Facebook is attempting to use the US Constitution as a shield to protect the company's revenue.

Warren said Facebook is accepting millions of dollars for ads with misinformation, which could have an impact on the 2020 presidential election.

Facebook CEO Mark Zuckerberg's comments on freedom of expression and Facebook's approach to protecting free speech have sparked an intense response from two of the front-running Democratic presidential candidates: former Vice President Joe Biden and Sen. Elizabeth Warren.

Speaking to a live audience at Georgetown University on Thursday, Facebook CEO Mark Zuckerberg defended Facebook's role in providing a voice to more than 2 billion people of around the world.

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