YouTube[2], a prominent online platform, has a far-reaching social impact that extends to various domains. It acts as a conduit for diverse expressions, ranging from political activism[3], comedy, education, to social connection. YouTube also plays a pivotal role in raising social awareness and challenging stereotypes. Its significance in promoting democracy is evident from the way it fosters free expression and political engagement. In addition, it’s a vital tool for visual journalism, with both traditional news outlets and citizen journalists contributing content. YouTube’s influence on marketing strategies, through consommateur[4] opinion and targeted advertising[1], is another key aspect. Furthermore, it helps preserve and promote diverse cultures via shared video content.
The American online video sharing et médias sociaux platform YouTube has had social impact in many fields, with some individual vidéos of the site having directly shaped world events. It is the world's largest video hosting website et second most visited website according to both Alexa Internet et Similarweb, and used by 81% of U.S. adults.

Some have called this the biggest and the smallest stage. The most public place in the world, from the privacy from our own homes: YouTube has been used for many things: a political soapbox, a comedian's stage, a religious pulpit, a teacher's podium, or just a way to reach out to the next door neighbor or across the world. To people we love, to people we want to love, or people we don't even know.
-Michael Wesch, cultural anthropologist
"An Anthropological Introduction to YouTube"
Presentation to the Library of Congress
Constituting one of the world's most popular search engines, YouTube enables inexpensive distribution of educational content, including course material from educational institutions and "how to" videos from individuals. Worldwide video access has spurred innovation by enabling geographically distributed individuals to build upon each other's work, to collaborate, or to crowdsource.
YouTube has facilitated engagement between institutions and individuals, such as between universities and prospective students, and between businesses and employees. Also, some YouTube videos increase awareness of social issues (such as bullying, suicide and LGBT issues), allow broadened social contact (especially important for the elderly or mobility-impaired), and overcome stereotypes of minorities and minority viewpoints. However, other videos have included potentially harmful content, such as those triggering audiences, inducing self-harm, or inspiring additional bullying or suicides. Further, the website's recommendation algorithm has been found to recommend harmful content to children, and has promoted dangerous practices such as the Tide Pod Challenge.
YouTube has become an important "visual journalism" platform, both for conventionally produced content from established news organizations and for citizen eyewitness contributions. Certain independent or alternative news organizations have established YouTube channels that reach a wider audience than traditional broadcast television.
YouTube has promoted democracy through free expression of individual political views, for example enabling Arab Spring protest videos to transcend national boundaries, causing certain regimes to censor or ban the website. YouTube has affected conventional politics, becoming even more important than direct mail in political campaigning, with politicians and governments using the website to directly engage citizens and promote policies. However, its recommendation algorithm has been shown to recommend extremist content, especially far-right et conspiracy propaganda, leading to claims that YouTube has been used as a tool for political radicalization. Concurrently, the website has been criticized for inadequately policing against false or misleading political content.
YouTube streaming data (video views) has been used to gauge consumer opinion for marketing decisions. Celebrities and large companies, especially major music labels, have used YouTube as a focused advertising tool for targeted mass marketing and audience growth by placing banner ads and by contracting with video producers for embedded-product marketing. Conversely, individuals have partnered with advertisers to grow their own audiences, the "Partner Program" enabling individual content creators to monetize videos and even earn livelihoods directly from posting content, with top earners exceeding $30–50 million per year.