Facebook Chief Executive Mark Zuckerberg will meet this week with prominent conservatives in the media, a spokesman said on Sunday, to address allegations of political bias at the popular social networking site.

Some 12 “conservative thought leaders” will join the meeting with Zuckerberg on Wednesday, a Facebook spokesman said. Among the invitees are media personality Glenn Beck, Fox News Channel’s “The Five” co-host Dana Perino and Zac Moffatt, co-founder of Targeted Victory, a technology company that aims to bring transparency to media buying.

Facebook came under fire last week when an unnamed former employee told technology news website Gizmodo that workers often omitted conservative political stories from the company’s “trending” list of topics.