facebook chief executive mark zuckerberg meet week prominent conservatives media spokesman say sunday address allegations political bias popular social network site 12 conservative think leaders join meet zuckerberg wednesday facebook spokesman say among invite media personality glenn beck fox news channel five co-host dana perino zac moffatt co-founder target victory technology company aim bring transparency media buy facebook come fire last week unnamed former employee tell technology news website gizmodo workers often omit conservative political stories company trend list topics zuckerberg say facebook find evidence report true would continue investigate u.s. senate committee also open inquiry facebook practice beck former fox news host take facebook early sunday say go meet menlo park california would interest look zuckerberg eye explain private business support right run way desire without government interference beck say would wonderful tool like face book sic independently choose hold freedom speech freedom association corporate principle friday facebook outline trend topics guidelines media relations section state reviewers neither allow advise discriminate source facebook value around 350 billion become big source news billion daily active users sixty-three percent users 41 percent u.s. adults say get news site accord study last year pew research center knight foundation facebook 's zuckerberg meet conservatives political bias flap