2018, a year consumed by misinformation RS_00002509.jpg
2018, a year consumed by misinformation RS_00002509.jpg
Now playing
03:37
2018, a year consumed by misinformation
press freedom your freedom_00015709.jpg
press freedom your freedom_00015709.jpg
Now playing
03:23
Why press freedom is your freedom
Trump boos calls media fake Davos_00000000.jpg
Trump boos calls media fake Davos_00000000.jpg
Now playing
00:44
Crowd boos as Trump calls media 'fake'
Laptop computer with binary code on screen.
Thinkstock
Laptop computer with binary code on screen.
Now playing
03:29
The real problems with fake news
CNN
Now playing
00:57
Flake: Trump rhetoric dangerous to journalists
AFP/Getty Images
Now playing
01:46
No! Don't share this stuff online!
pool
Now playing
01:45
Spicer spars with reporters over 'fake news'
Welch being arrested
Sathi Soma
Welch being arrested
Now playing
02:08
How did 'pizzagate' inspire violence?
CNN
Now playing
02:58
Tapper: Trump not a good judge of news sources
Brian Karem
CNN
Brian Karem
Now playing
02:33
Reporter fires back on 'fake news' attack
abcnews.com.co
Now playing
03:20
Fake news sites designed to trick you
robby mook kellyanne conway tapper fake news origwx allee_00004616.jpg
CNN
robby mook kellyanne conway tapper fake news origwx allee_00004616.jpg
Now playing
02:35
Trump and Clinton aides discuss fake news
newday gun incident fake news johns live_00002027.jpg
Sathi Soma
newday gun incident fake news johns live_00002027.jpg
Now playing
01:08
Cops: Armed man investigating fake news story
New name for fake news: "viral deception"_00012323.jpg
New name for fake news: "viral deception"_00012323.jpg
Now playing
04:11
New name for fake news: 'viral deception'
denying fake news foster pkg_00020814.jpg
Entertainment One
denying fake news foster pkg_00020814.jpg
Now playing
02:45
'Fake news' lessons from Holocaust-denial case
Welch being arrested
Sathi Soma
Welch being arrested
Now playing
03:04
White House: Fake news can cause real harm
Fake news
Fake news
Now playing
03:05
Fake news stories thriving on social media
A person browses through media websites on a computer in Singapore on May 30, 2013.  Singapore's official media watchdog on May 30 refuted claims by online critics that a new rule requiring news websites to obtain licences was aimed at stifling Internet freedom.     AFP PHOTO/ROSLAN RAHMAN        (Photo credit should read ROSLAN RAHMAN/AFP/Getty Images)
ROSLAN RAHMAN/AFP/AFP/Getty Images
A person browses through media websites on a computer in Singapore on May 30, 2013. Singapore's official media watchdog on May 30 refuted claims by online critics that a new rule requiring news websites to obtain licences was aimed at stifling Internet freedom. AFP PHOTO/ROSLAN RAHMAN (Photo credit should read ROSLAN RAHMAN/AFP/Getty Images)
Now playing
06:24
Essay: A new age of information warfare
(CNN Business) —  

YouTube is making changes to its recommendation algorithm, which serves up new videos for users to watch, in an effort to crack down on the spread of conspiracy theories on its platform.

In a blog post on Friday, the Google-owned company said it would start reducing its recommendations of “borderline content” and videos that may misinform users in “harmful ways.”

“Borderline content” includes videos featuring fake miracle cures for serious diseases, claiming the earth is flat and making blatantly false claims about historic events such as 9/11, according to the company. It did not provide further examples. Such content doesn’t violate YouTube’s community guidelines, but the company says it comes close.

YouTube has long faced criticism for allowing misinformation, conspiracy theories and extremist views to spread on its platform, and for recommending such content to users. People who came to the site to watch videos on innocuous subjects, or to see mainstream news, have been pushed toward increasingly fringe and conspiracist content.

This month, a Washington Post investigation found a YouTube search for Supreme Court Justice Ruth Bader Ginsburg’s initials “RBG” tur