facebook chief executive mark zuckerberg hear dozen u.s. conservative leaders wednesday say work build trust users believe social network display politically bias news content closed-door meet company silicon valley headquarter zuckerberg defend company practice acknowledge many conservatives believe facebook politically liberal make sense mission business suppress political content zuckerberg write facebook meet know many conservatives trust platform surface content without political bias add want hear concern personally open conversation build trust editorial practice world large social network come scrutiny former facebook contractor anonymously accuse editors deliberately suppress conservative news allegations report technology news website gizmodo identify ex-contractor facebook deny allegations say would conduct full investigation facebook spokeswoman say meet produce constructive discussion attendees call productive think facebook sincere want resolve outstanding issue conservatives brent bozell president media research center say meet attendees frank concern tone cordial bozell say facebook invite frank talk people hold back much say facebook page conservative cnn commentator s.e cupp say meet produce strong commitments address issue well work together common goals attendees include former white house press secretary dana perino media personality glenn beck former republican senator jim demint zuckerberg say silicon valley reputation liberal facebook 1.6 billion users span every background ideology reality conservatives republicans always important part facebook zuckerberg write presumptive republican nominee donald trump facebook fan presidential candidate say fox news drive interactions facebook page news outlet world zuckerberg add even close fox news own rupert murdoch 21st century fox foxa.o facebook employees donate presidential candidates lean democratic seventy-nine percent employee contributions 2016 contenders go democrats accord reuters analysis campaign finance data 21 percent republicans zuckerberg contribute candidates party sixty-percent donations 2014 midterm elections go republicans 40 percent democrats support presidential candidate cycle although u.s. senate committee investigate whether liberal bias selection trend topics little chance government try regulate facebook practice say republican senator john thune chairman senate commerce committee reason believe would necessary thune tell reporters tuesday thune send letter facebook last week demand explain editorial decision-making stories choose trend topics feature say primary concern facebook potentially deceptive news fee curation algorithms work facebook last week release guidelines choose trend topics operations news fee algorithm remain closely guard legal experts say government tool dictate private company make news decisions legal matter facebook require even-handed say eugene volokh law professor university california los angeles congress introduce something try prohibit facebook make kinds choices facebook 's zuckerberg meet u.s. conservatives bias controversy