Hash sharing: violent extremism
YouTube utilises technology to prevent re-uploads of known violative content before that
content is available to the public. For a long time, we have used this technology to prevent the spread
of child sexual abuse imagery on the platform. In 2016, we created a
hash-sharing database with industry partners where we share hashes (or 'digital
fingerprints') of terrorist content to stop its spread. The shared database currently
contains more than 400,000
unique hashes that are near-identical to the human eye.
YouTube's vast media library and automated
detection systems make us a large contributor of hashes to the hash-sharing database.
In accordance with the sharing criteria established by the Global Internet Forum to Counter
Terrorism, YouTube contributed over 45,000 unique hashes to the hash-sharing database in 2023.
Once content has been hashed, other platforms can use those hashes to help detect related
content on their platforms and assess it against their own content policies. Since 2017,
the number of companies contributing to and benefitting from this database has grown from 4 to
13. This organised effort is now formally operated by the Global Internet Forum to
Counter Terrorism (GIFCT).
Global Internet forum to counter terrorism: violent extremism
In 2017, YouTube, Facebook, Microsoft and Twitter founded the Global Internet Forum to
Counter Terrorism (GIFCT)
as a group of companies, dedicated to disrupting terrorist abuse of members’ digital
platforms. Although our companies have been sharing best practices around
counter-terrorism for several years, GIFCT provided a more formal structure to accelerate
and strengthen this work and present a united front against the online dissemination of
terrorist content. In collaboration with the
Tech Against Terrorism initiative, GIFCT hosts global workshops, engaging tech
companies, non-governmental organisations and international government bodies.
With varied members and industry partners using the hash-sharing database, there needed to be
a baseline consensus for what would constitute terrorist and extremist content for the
purposes of reviewing and sharing hashes of content. As noted in GIFCT's
2021 Annual Transparency Report, ‘the original scope of the hash-sharing database is limited
to content related to organisations on the United Nations Security Council's Consolidated
Sanctions List’.
YouTube and GIFCT's other founding members signed on to the
Christchurch Call to Eliminate Terrorist and Violent Extremist Content Online.
Building on the Christchurch Call, GIFCT developed a new
Content Incident Protocol (CIP) for GIFCT member companies to respond efficiently
to perpetrator-created, live-streamed content after a real-world, violent event.
This protocol has been tested and proven effective, for example, following the attack on a
synagogue in
Halle, Germany (October 2019); a shooting in Glendale,
Arizona, US (May 2020); a shooting in Buffalo, New York,
US (June 2022); and a shooting in Memphis,
Tennessee, US (September 2022). Since creating the CIP, GIFCT has further developed its
Incident Response Framework to include a Content Incident tier to respond to
non-live-streamed, perpetrator-produced video and images depicting the real-world event.
This was activated for the first time following an attack in
Udaipur,
Rajasthan, India (July 2022).
GIFCT has evolved to be a standalone organisation with an independent
Executive Director and staff. GIFCT's structure also includes an
Independent Advisory Committee composed of government representatives and
non-governmental members, including advocacy groups, human rights specialists,
researchers and technical experts. Within the new governance framework of the institution,
YouTube holds a position on GIFCT's Executive Operating Board.