META AI (prev. Facebook AI)
Reinforcement Integrity Optimizer (RIO)
From Meta AI:
"AI systems are only as good as the data they are trained with. If they don’t have the right mix of examples to learn from, even sophisticated models will struggle. 
This is especially true and important when building tools to deal with hate speech. Hate speech varies from country to country or even group to group — and it can evolve rapidly, drawing on current events or trends. 
People also try to disguise hate speech with sarcasm and slang, intentional misspellings, and sophisticated photo alterations. And effective tools have to not just find problems but also avoid mistakes. A false positive can prevent someone from communicating with friends or others in their community."