“But a number of major social media companies are wary of the idea. They say there is no clear consensus in the United States, and globally, as to what constitutes a terrorist image, and they might end up expunging material posted by researchers or media organizations. And, they say, once a database is created, governments around the world will place additional data requests on them — and some countries’ will probably demand the removal of legitimate political content under the guise of fighting terrorism.”

Source: New tool to take down terrorism images online spurs debate on what constitutes extremist content – The Washington Post