Illusory Truth Effect
Illusory truth effect is a social psychological term which is also known as validity effect, or reiteration effect. It is the inclination to believe that something is actually true when you keep coming across it. Since more familiar information is easier to process, it also tends to be easily accepted.
For example, fake news may become more convincing when it is spread through various social media platforms. Illusory truth effect may also explain the convincing power of commercials and election campaigns.