![]() ![]() But hashing is essentially a pattern-recognition tool, and it can be fooled with small changes. YouTube, Facebook and other platforms scrambled to remove the Christchurch attack videos using a process known as “hashing,” where a piece of content is fingerprinted with a digital hash so algorithms can spot duplicates whenever they are re-uploaded. But the technique they relied on in their takedown efforts can create a different problem: the mistaken removal of content such as news reporting or other protected forms of expression without sufficient transparency and controls. These platforms and others nevertheless faced criticism for their inability to remove all copies of the video, which clearly violated their internal rules for acceptable content. Facebook reported that it removed 1.5 million videos of the attack in the first 24 hours alone. At times, YouTube said, copies were uploaded to its servers at a rate of one copy per second. ![]() The white supremacist who attacked two mosques in Christchurch, New Zealand, created a Facebook livestream of his assault that spread at an alarming rate. ![]()
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