Mark Zuckerberg says AI won't be able to reliably detect hate speech for 'five to 10' years

  • Facebook CEO Mark Zuckerberg said that while it's relying increasingly on artificial intelligence to police content on its site, AI doesn't work well for identifying hate speech.
  • AI won't be ready to reliably distinguish hate speech from legitimate expression for another five to 10 years, he said.
  • Zuckerberg's comments came during his testimony Tuesday at a Senate hearing focusing on the Cambridge Analytica scandal.


Facebook is increasingly relying on artificial intelligence to identify content posted to its service that violates its policies, but CEO Mark Zuckerberg said there's one type of content AI struggles with — hate speech.

Indeed, it will take another five to 10 years for AI to be ready to police hate speech and be able to reliably distinguish it from legitimate political expression, Zuckerberg told senators during his testimony at a congressional hearing Tuesday. Although Facebook has worked on AI that could identify hate speech, the error rates are just too high, he said.

"We're not there yet," he said.

Hate speech is a problem for AI, because it's subject to lots of nuance, he said. Also, because Facebook operates in numerous countries around the world, its AI needs to understand those nuances in multiple languages.

"You have to understand what's a slur and whether something hateful," he said.

Photos from the testimony: 

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Facebook CEO Mark Zuckerberg testifies before Congress
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Facebook CEO Mark Zuckerberg testifies before Congress
WASHINGTON, DC - APRIL 10: Facebook co-founder, Chairman and CEO Mark Zuckerberg arrives to testify before a combined Senate Judiciary and Commerce committee hearing in the Hart Senate Office Building on Capitol Hill April 10, 2018 in Washington, DC. Zuckerberg, 33, was called to testify after it was reported that 87 million Facebook users had their personal information harvested by Cambridge Analytica, a British political consulting firm linked to the Trump campaign. (Photo by Chip Somodevilla/Getty Images)
Facebook CEO Mark Zuckerberg arrives to testify before a House Energy and Commerce Committee hearing regarding the company?s use and protection of user data on Capitol Hill in Washington, U.S., April 11, 2018. REUTERS/Leah Millis
Facebook CEO Mark Zuckerberg arrives to testify before a House Energy and Commerce Committee hearing regarding the company?s use and protection of user data on Capitol Hill in Washington, U.S., April 11, 2018. REUTERS/Leah Millis
Facebook CEO Mark Zuckerberg testifies before a House Energy and Commerce Committee hearing regarding the company?s use and protection of user data on Capitol Hill in Washington, U.S., April 11, 2018. REUTERS/Leah Millis
Facebook CEO Mark Zuckerberg arrives to testify before a joint hearing of the US Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee on Capitol Hill, April 10, 2018 in Washington, DC. / AFP PHOTO / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Mark Zuckerberg, chief executive officer and founder of Facebook Inc., waits to begin a joint hearing of the Senate Judiciary and Commerce Committees in Washington, D.C., U.S., on Tuesday, April 10, 2018. Lawmakers will grill Zuckerberg on issues ranging from the troves of data vacuumed up by app developers and political consultant Cambridge Analytica to Russian operatives' use of the social network to spread misinformation and discord during the 2016 U.S. presidential election. Photographer: Andrew Harrer/Bloomberg via Getty Images
Facebook founder and CEO Mark Zuckerberg arrives to testify during a Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee joint hearing about Facebook on Capitol Hill in Washington, DC, April 10, 2018. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Facebook founder and CEO Mark Zuckerberg arrives to testify during a Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee joint hearing about Facebook on Capitol Hill in Washington, DC, April 10, 2018. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Facebook CEO Mark Zuckerberg arrives to testify before a Senate Judiciary and Commerce Committees joint hearing regarding the company?s use and protection of user data, on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Leah Millis
Facebook CEO Mark Zuckerberg arrives to testify before a Senate Judiciary and Commerce Committees joint hearing regarding the company?s use and protection of user data on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Aaron P. Bernstein
Facebook CEO Mark Zuckerberg arrives to testify before a Senate Judiciary and Commerce Committees joint hearing regarding the company?s use and protection of user data, on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Aaron P. Bernstein
The witness table is seen before Facebook CEO Mark Zuckerberg appearance at a joint hearing of the Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee on Capitol Hill, April 10, 2018 in Washington, DC. / AFP PHOTO / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Facebook CEO Mark Zuckerberg arrives to testify before a joint hearing of the US Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee on Capitol Hill, April 10, 2018 in Washington, DC. / AFP PHOTO / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Facebook CEO Mark Zuckerberg arrives to testify before a joint hearing of the US Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee on Capitol Hill, April 10, 2018 in Washington, DC. / AFP PHOTO / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Facebook CEO Mark Zuckerberg arrives to testify before a joint hearing of the US Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee on Capitol Hill, April 10, 2018 in Washington, DC. / AFP PHOTO / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Facebook founder and CEO Mark Zuckerberg arrives to testify during a Senate Commerce, Science and Transportation Committee and Senate Judiciary Committee joint hearing about Facebook on Capitol Hill in Washington, DC, April 10, 2018. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
WASHINGTON, DC - APRIL 10: Facebook co-founder, Chairman and CEO Mark Zuckerberg arrives to testify before a combined Senate Judiciary and Commerce committee hearing in the Hart Senate Office Building on Capitol Hill April 10, 2018 in Washington, DC. Zuckerberg, 33, was called to testify after it was reported that 87 million Facebook users had their personal information harvested by Cambridge Analytica, a British political consulting firm linked to the Trump campaign. (Photo by Chip Somodevilla/Getty Images)
Facebook CEO Mark Zuckerberg listens while testifying before a joint Senate Judiciary and Commerce Committees hearing regarding the company?s use and protection of user data, on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Leah Millis
Facebook CEO Mark Zuckerberg takes a drink while testifying before a Senate Judiciary and Commerce Committees joint hearing regarding the company?s use and protection of user data on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Alex Brandon/Pool
Facebook CEO Mark Zuckerberg takes a drink while testifying before a Senate Judiciary and Commerce Committees joint hearing regarding the company?s use and protection of user data on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Alex Brandon/Pool
Facebook CEO Mark Zuckerberg testifies before a joint Senate Judiciary and Commerce Committees hearing regarding the company?s use and protection of user data, on Capitol Hill in Washington, U.S., April 10, 2018.
Facebook CEO Mark Zuckerberg testifies before a Senate Judiciary and Commerce Committees joint hearing regarding the company?s use and protection of user data on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Aaron P. Bernstein
Facebook CEO Mark Zuckerberg sits down following a break to resume testifying before a joint Senate Judiciary and Commerce Committees hearing regarding the company?s use and protection of user data, on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Leah Millis
Facebook CEO Mark Zuckerberg sits down following a break to resume testifying before a joint Senate Judiciary and Commerce Committees hearing regarding the company?s use and protection of user data, on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Leah Millis
Senator John Kennedy (R-LA) listens as Facebook CEO Mark Zuckerberg testifies before a joint Senate Judiciary and Commerce Committees hearing regarding the company?s use and protection of user data, on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Leah Millis
Sen. Shelley Moore Capito (R-WV) listens as Facebook CEO Mark Zuckerberg testifies before a joint Senate Judiciary and Commerce Committees hearing regarding the company?s use and protection of user data, on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Leah Millis
Senator John Kennedy (R-LA) (L) looks on as Senator Lindsey Graham (R-SC) holds up the privacy agreement of Facebook as its CEO Mark Zuckerberg testifies before a joint Senate Judiciary and Commerce Committees hearing regarding the company?s use and protection of user data, on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Leah Millis
Facebook CEO Mark Zuckerberg responds to a question about his own personal information becoming public as he testifies before a joint Senate Judiciary and Commerce Committees hearing regarding the company?s use and protection of user data, on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Leah Millis
Facebook CEO Mark Zuckerberg testifies before a joint Senate Judiciary and Commerce Committees hearing regarding the company?s use and protection of user data, on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Aaron P. Bernstein
Facebook CEO Mark Zuckerberg is surrounded by members of the media as he arrives to testify before a Senate Judiciary and Commerce Committees joint hearing regarding the company?s use and protection of user data, on Capitol Hill in Washington, U.S., April 10, 2018. REUTERS/Leah Millis TPX IMAGES OF THE DAY
WASHINGTON, DC - APRIL 09: Facebook CEO Mark Zuckerberg (2 L) arrives at a meeting with U.S. Sen. Bill Nelson (D-FL), ranking member of the Senate Committee on Commerce, Science, and Transportation, April 9, 2018 on Capitol Hill in Washington, DC. Zuckerberg is scheduled to testify before a few Congressional committees this week on the mass users data Facebook has shared with political operatives. (Photo by Alex Wong/Getty Images)
UNITED STATES - APRIL 9: Facebook CEO Mark Zuckerberg arrives for his meeting with Sen. Bill Nelson, D-Fla., in the Hart Senate Office Building on Monday, April 9, 2018. Zuckerberg is on Capitol Hill to testify before the House and Senate this week. (Photo By Bill Clark/CQ Roll Call)
Mark Zuckerberg and Andrea Besmehn, Mark Zuckerbergs executive assistant at Facebook depart US Senator Bill Nelson's, D-Florida, office on Capitol Hill in Washington, DC, on April 9, 2018. Embattled Facebook chief Mark Zuckerberg has placed the blame for security lapses at the world's largest social network squarely on himself as he girded Monday for appearances this week before angry lawmakers.In prepared remarks released by a congressional panel, Zuckerberg admitted he was too idealistic and failed to grasp how the platform -- used by two billion people -- could be abused and manipulated. / AFP PHOTO / JIM WATSON / The erroneous mention[s] appearing in the metadata of this photo by JIM WATSON has been modified in AFP systems in the following manner: [Andrea Besmehn (R), Mark Zuckerbergs executive assistant at Facebook] instead of [Priscilla Chan]. Please immediately remove the erroneous mention[s] from all your online services and delete it (them) from your servers. If you have been authorized by AFP to distribute it (them) to third parties, please ensure that the same actions are carried out by them. Failure to promptly comply with these instructions will entail liability on your part for any continued or post notification usage. Therefore we thank you very much for all your attention and prompt action. We are sorry for the inconvenience this notification may cause and remain at your disposal for any further information you may require. (Photo credit should read JIM WATSON/AFP/Getty Images)
WASHINGTON, DC - APRIL 09: Facebook CEO Mark Zuckerberg (C) leaves after a meeting with U.S. Sen. Bill Nelson (D-FL), ranking member of the Senate Committee on Commerce, Science, and Transportation, April 9, 2018 on Capitol Hill in Washington, DC. Zuckerberg is scheduled to testify before a few Congressional committees this week on the mass users data Facebook has shared with political operatives. (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - APRIL 09: Facebook CEO Mark Zuckerberg (3rd L) leaves after a meeting with U.S. Sen. Bill Nelson (D-FL), ranking member of the Senate Committee on Commerce, Science, and Transportation, April 9, 2018 on Capitol Hill in Washington, DC. Zuckerberg is scheduled to testify before a few Congressional committees this week on the mass users data Facebook has shared with political operatives. (Photo by Alex Wong/Getty Images)
Mark Zuckerberg, chief executive officer and founder of Facebook Inc., exits after a meeting with Senator Dianne Feinstein, a Democrat from California, not pictured, on Capitol Hill in Washington, D.C., U.S., on Monday, April 9, 2018. Zuckerberg, in prepared testimony for the U.S. House of Representatives, said all of Facebook's problems are his mistake. Photographer: Yuri Gripas/Bloomberg via Getty Images
WASHINGTON, DC - APRIL 09: Facebook CEO Mark Zuckerberg (C) leaves the office of Sen. Dianne Feinstein (D-CA) after meeting with Feinstein on Capitol Hill on April 9, 2018 in Washington, DC. Zuckerberg is meeting with individual senators in advance of tomorrow's scheduled hearing before the Senate Judiciary and Commerce committeees. Zuckerberg is under pressure to explain why tens of millions of Facebook user's private information was shared with Cambridge Analytica. (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - APRIL 09: Facebook CEO Mark Zuckerberg (C) leaves the office of Sen. Dianne Feinstein (D-CA) after meeting with Feinstein on Capitol Hill on April 9, 2018 in Washington, DC. Zuckerberg is meeting with individual senators in advance of tomorrow's scheduled hearing before the Senate Judiciary and Commerce committeees. (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - APRIL 09: Facebook CEO Mark Zuckerberg (3rd L) leaves after a meeting with U.S. Sen. Bill Nelson (D-FL), ranking member of the Senate Committee on Commerce, Science, and Transportation, April 9, 2018 on Capitol Hill in Washington, DC. Zuckerberg is scheduled to testify before a few Congressional committees this week on the mass users data Facebook has shared with political operatives. (Photo by Alex Wong/Getty Images)
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In his testimony, Zuckerberg noted that Facebook originally relied on its users to identify objectionable content. In the wake of the 2016 election and reports that Russian-linked actors hijacked Facebook's service to spread fake news and other propaganda, the company has been stepping up efforts to police content on the service. Facebook expects to have some 20,000 people working on security and reviewing content by the end of this year, Zuckerberg said.

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