Holocaust Denial 

Denial of the Holocaust began as the genocide was happening with Nazi officials. When other countries would inquire about what was going on, Nazis would downplay their crimes, using phrases such as "resettlement" to describe what they were doing with the Jews. After the war, not only did former Nazis deny the Holocaust, but so did Americans and Europeans. There are many reasons for denial, whether that be antisemitism, extremism, or being misinformed. While these groups were somewhat prominent throughout the 20th century, the age of the internet only made things worse. 

Social media allowed for these individuals to spread their message and opinions, expanding the Holocaust denial community. Social media algorithms only make this worse, as they continue to feed the user similar content to what they've liked in the past in an attempt to keep them engaged. These algorithms might link the Holocaust to other political conspiracy theories, which means someone might get drawn into Holocaust denial without even knowing it. Spreading misinformation is easier now more than ever, since everyone has the ability to post information globally at their fingertips. In the past, the Holocaust deniers had to go through a lot more hoops to spread their message, as they either had to pose as historians or get a newspaper to publish their article, for only a limited audience to see. Now it's as simple as typing away on a screen for a few minutes and clicking 'post,' for the entire world to see.