  With the prevalence of misinformation online, researchers have focused on
developing various machine learning algorithms to detect fake news. However,
users' perception of machine learning outcomes and related behaviors have been
widely ignored. Hence, this paper proposed to bridge this gap by studying how
to pass the detection results of machine learning to the users, and aid their
decisions in handling misinformation. An online experiment was conducted, to
evaluate the effect of the proposed machine learning warning sign against a
control condition. We examined participants' detection and sharing of news. The
data showed that warning sign's effects on participants' trust toward the fake
news were not significant. However, we found that people's uncertainty about
the authenticity of the news dropped with the presence of the machine learning
warning sign. We also found that social media experience had effects on users'
trust toward the fake news, and age and social media experience had effects on
users' sharing decision. Therefore, the results indicate that there are many
factors worth studying that affect people's trust in the news. Moreover, the
warning sign in communicating machine learning detection results is different
from ordinary warnings and needs more detailed research and design. These
findings hold important implications for the design of machine learning
warnings.
