A group of rohinga refugees in Germany have filed a lawsuit against facebook. They accuse the social media company of failing to act on anti-rohinga speech. This comes as facebook is already facing criticism about the harm it may be causing. Revelations by whistle blower francis howgan showed how much facebook knows about these harms. academics are trying to find out more, but our european technology correspondent, matometa mergia, has found that research s are struggling to access the data they need.