Excerpt:
For eight years, the jihadist propaganda of Anwar al-Awlaki has helped shape a generation of American terrorists, including the Fort Hood gunman, the Boston Marathon bombers and the perpetrators of massacres in San Bernardino, Calif., and Orlando, Fla.
And YouTube, the world's most popular video site, has allowed hundreds of hours of Mr. Awlaki's talks to be within easy reach of anyone with a phone or computer.
Now, under growing pressure from governments and counterterrorism advocates, YouTube has drastically reduced its video archive of Mr. Awlaki, an American cleric who remains the leading English-language jihadist recruiter on the internet six years after he was killed by a United States drone strike. Using video fingerprinting technology, YouTube now flags his videos automatically and human reviewers block most of them before anyone sees them, company officials say.