Rupert Murdoch has accused tech giants Google and Facebook of silencing conservative voices on their platforms and has called for “significant reform” and transparency around digital advertising supply chains. “What we have seen in the past few weeks about the practices at Facebook and Google surely reinforces the need for significant reform,” the News Corp executive chairman told an annual shareholder meeting on Nov. 17. “There is no doubt that Facebook employees try to silence conservative voices and a quick Google News search on most contemporary topics often reveals a similar pattern of selectivity—or to be blunt, censorship.” Facebook has previously denied it silences conservative voices, with Mark Zuckerberg in 2016 declaring in a post on his social media platform that he took the report it was censoring news on its trending topics very seriously. “We take this report very seriously and are conducting a full investigation to ensure our …