Madden had founded a technology hub and start-up accelerator in Yangon called Phandeeyar. He said he and others involved with the venture interacted with Facebook “many dozens” of times over the next several years, including via email, in the private Facebook group and in person, showing how the network’s systems for detecting and removing dangerous content were ineffective. He isn’t sure what steps the company took in response. “The central problem is that the mechanisms that they have to pull down hate speech in a timely way, before it does real world harm, they don’t work,” he said.