Mark Zuckerberg has kicked off a probe into claims Facebook suppressed pro-conservative stories and forced others to artificially appear in the social media site's influential "trending topics" list.
In a post on Thursday evening, the Facebook CEO said that being open to all viewpoints was at the "core of everything Facebook is and everything I want it to be."
"Every tool we build is designed to give more people a voice and bring our global community together," he said.
Zuckerberg's comments came after tech blog Gizmodo kicked off a furor on Monday over whether Facebook allowed its "trending topics" module to move organically in line with users' interests, or manipulated it by using news judgment similar to that employed by traditional media outlets.
Gizmodo cited former Facebook "news curators," who claimed that fellow curators had routinely prevented stories with a conservative slant from appearing on the site's "trending topics" list.