Tech giants have found a way to fight extremism online. Is it working?

Internet companies have been criticized for not doing enough to block extremist rhetoric on their sites. And though several have stepped up efforts to remove violent and hateful content, ISIS propaganda continues to proliferate on social media.

Now, Google’s parent company Alphabet, with the help of Facebook and Twitter, is experimenting with another approach to combating radicalization online, whether it’s ISIS supporters or white supremacists.