WASHINGTON — Republicans accused Twitter of being biased against conservatives on Wednesday, drawing rebukes from Democrats in a congressional hearing that illustrated how partisan lines are increasingly being drawn on social media.

The sparring focused on the testimony of Jack Dorsey, Twitter’s chief executive, who repeatedly denied the accusations during a hearing before the House Energy and Commerce Committee. Republicans grilled Mr. Dorsey, suggesting that Twitter’s algorithms suppress conservative viewpoints and discriminate against Republican voices. 

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