Antisemitic posts claiming that the Holocaust is a lie and that Jews are “barbaric and unsanitary” remain on Facebook despite being flagged to the social media company, an investigation by The Times has found. David Ibsen, executive director of the Counter Extremism Project, said: "Facebook not only allows Holocaust deniers and antisemitism to continue to be freely available online but Mr Zuckerberg is using freedom of expression as his excuse. These antisemitic views are against Facebook's own community guidelines. We urge Facebook to take meaningful and urgent action to ensure their platform is not used for encouraging violent and illegal activity like this."