For more than a decade, researchers and journalists have relied on a digital tool called CrowdTangle to track and fight the spread of viral falsehoods online. But earlier this week, the owner of CrowdTangle, Meta, shut the tool down. The tech giant has replaced it with its new Content Library, which it says will serve the same purpose and be “more user friendly”. As long-time users of CrowdTangle to track and analyse online misinformation campaigns, we are sceptical of this claim. We are also very concerned by the fact CrowdTangle’s closure comes at a time when misinformation on social media…