LOS ANGELES AP — Mark Zuckerberg on Wednesday held a wide-ranging discussion with a group of conservative commentators who said afterward the Facebook CEO acknowledged the giant social network has a problem reaching conservatives.

While the Facebook executives did not comment further on an internal investigation into allegations of political manipulation, they explained how difficult it would be for Facebook employees to inject bias into what stories make it into the "trending topics" section of the site or on individual users' news feeds, Cupp said.

In a Facebook post afterward, Zuckerberg did not directly respond to allegations that Facebook employees suppressed conservative stories on its "trending topics" feature.

"I wanted to hear their concerns personally and have an open conversation about how we can build trust.

Topics that appear as trending can have a self-fulfilling effect, as more Facebook readers see and share the items, and other news organizations decide to write their own stories.

AP Technology Writer Barbara Ortutay in New York contributed to this report.

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