30 3. HOW SOCIAL CONTEXT HELPS
3.1.2 USER BEHAVIOR MODELING
flag
when-to-fact-check
what-to-fact-check
When-to-Fact-Check
U
C endogenous events
exogenous events
exogenous events
N
e
.t/
e
.t/
t N
f
.t/
flags
t
N
N .t/
N
N .t/ WD p.y D 1jf D 1/N
f
.t/ C p.y D 1jf D 0/.N
e
.t/ N
f
.t//;
p.y D 1jf D 1/ p.y D 1jf D 0/
y D 1 f D 1
f D 1
N
N .t/
https://newsroom.fb.com/news/2016/12/news-feed-fyi-addressing-hoaxes-and-fake-news/
https://www.washingtonpost.com/news/the-switch/wp/2017/06/29/twitter-is-looking-for-ways-to-
let-users-flag-fake-news
https://www.scmp.com/news/china/policies-politics/article/2055179/how-chinas-highly-
censored-wechat-and-weibo-fight-fake