3.2. The potential of social media Social media has great potential. Political leaders are more inclined to use social media to achieve political purposes, but at the same time, political leaders are increasingly pushing discourse and behavior to extremes.  This embodiment reached its peak during Trump's administration. Twitter and other social media quickly promote false information and prank information, which once became a flood. Alternative facts and false news are "good" cases at this stage. The typical feature of new media is that it can directly transmit information to individuals without the intervention of "intermediaries" (editors and institutional gatekeepers). Political leaders and candidates are directly linked to their voters. But this has increased the instability and unpredictability of the new media in the process of political communication. The content of the report can be completely fabricated, and social networks even help the proliferation of false information and pranks. We find that stories often spread through the Internet are novel and easy to resonate among readers. Even these false facts can enter the legal news network platform and confuse people's audio-visual. The proliferation of misinformation hinders responsible decision-making. Thus, the possibility of political leaders making negative use of the power of social media has been realized. This undermines citizens' democratic governance right to access high-quality decision-making information. Trump's "reckless" use of Twitter enabled him to communicate directly with the public, manage his political allies and critics, and control the news agenda. This is a very typical example. It is not difficult to find that Trump's messages are always conflicting, confusing, and unclear, but he often uses a tone of trying to sell goods, helps users explain them with preconceived ideas, and helps trump cultivate a sense of trust and familiarity among his loyal fans. During Trump's administration, the concept of "post-truth society" was all the rage. Here, the so-called "post-truth" refers to the situation where truth and logic are ignored in the process of information dissemination and emotion incites the dominant public opinion. From voting to crowdfunding fraud to virus marketing. The truth is dismembered, distorted, and covered up by the messenger. Truth and logic are ignored in the process of information dissemination. Emotion incites dominant public opinion. Vague statements with core authenticity but inconsistent with the facts have become the currency of politicians, business executives, and other power brokers during the trump period.  Moreover, in the eyes of the "watchdog" - journalists, where politics is involved, the only bad news is worth reporting. People rarely hear stories about how some government agencies work well or admirable civil servants, which are "hidden" by journalists because they believe that this news does not have good economic value. Under the influence of the above factors and environment, "false Advances in Social Science, Education and Humanities Research, volume 631 907
news" is a typical product of this period. (fake news is an imitation and satire of the news. In the 2016 presidential election, this concept was added to fictional stories to make the reported articles look like real news content, to further confuse the audience. Fake news even spread wantonly on websites with legitimate news platforms and blogs, making extreme use of people's understanding of political leaders, political parties and organizations And mainstream news media). False news helps the government confuse basic facts with fictitious facts. "Post-truth society" disgusts and suffocates citizens. Therefore, CNN even launched the "fact first" campaign, hoping to break the deadlock and respond to the "continuous attack" of politics. In the dissemination of local information, "news desert" and "forced reading" are prevalent. The wrong information is often regarded as a fact. There is no responsible local news agency in the community where people live to provide information to residents and fight back against false reports. The wrong information is disseminated through people's social networks. It is worth mentioning that hosts all over the country often recite similar scripts and listen to the "command" of the political party. According to the research, local news stories affect the opinions of residents and largely affect the decision-making of community leaders. We may often ignore the importance of providing information and forming opinions for residents in small towns and suburban communities, but this is indeed a serious problem that cannot be ignored. "News desert" concentrates the ownership of media in the hands of large companies, which further destroys the real local news. The media "echo room" has exacerbated political polarization. People often choose the source of news and information according to the so-called affinity of politics. Social media has accelerated the development of the media "echo room". Although the media "echo room" helps people reach out to like-minded people and share information, it potentially isolates people with different views and reduces the diversity of "voices".