How Automated Content Moderation Works (Even When It Doesn't) - The Markup
Briefly

When social media platforms get as big as Instagram- more than 2 billion monthly active users-a huge majority of content moderation is automated.
In many ways, hashes operate like fingerprints, and content moderation algorithms search through their database of existing fingerprints to flag any matches to posts they already know they want to remove.
Read at Themarkup
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