Facebook (FB - Get Report) CEO Mark Zuckerberg resisted calls to tighten speech controls on the giant social media platform Thursday, saying that the company "must continue to stand for free expression."

Zuckerberg was speaking at Georgetown University on Thursday, just a few miles from Capitol Hill where lawmakers have called on the company to combat the rise of right wing extremism. 

"Some people believe that giving more people a voice is driving division rather than bringing people together. I am here today because I believe we must continue to stand for free expression," Zuckerberg told the crowd, according to the Wall Street Journal. 

Facebook shares were up 0.45% to $190.41 on Thursday afternoon.

Zuckerberg is scheduled to testify before the the House Financial Services Committee on Oct. 23 to discuss the company's fledgling Libra cryptocurrency. 

Libra has seen an exodus of backers since lawmakers have been putting pressure on members of the Libra Association to reconsider their partnership with the company. 

Mastercard (MA - Get Report) , Visa (V - Get Report) , and PayPal (PYPL - Get Report) are just some of the names that have left the once 28-company strong Libra Association. The Association now has just 21 members left. 

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