Indonesian is a national and unity language for Indonesian people. Every day, Indonesian people use Indonesian as the primary language to communicate with others. In this era of digitalization, the use of the Indonesian language on social media is inseparable. In social media language style, everyone has their way. One of them is using the language mixture while communicating on social media. Indonesian people often mix the Indonesian language with other languages such as local language and foreign language. Based on this situation, this research aims to provide facts and analyze the use of language mixture between the Indonesian language and other languages on social media. The method research is descriptive qualitative with observation through 5 social media platforms such as Facebook, Instagram, Tiktok, Twitter, and Youtube. The results of this research are 50 data from 5 social media platforms that mixed the Indonesian language with other languages. This research has limitations that are, the data observation-only observed 5 social media platforms and got only 50 data of mixed-language.

Information and Communication Technology is growing rapidly in the world's competition. This flow of development brings a big influence for its users including millennials who live in urban areas that always boast a western lifestyle culture that is reflected by the behavior of money-wasting habits that it has or called hedonism. This certainly causes the threat of degradation to the culture of local heritage that should be maintained by the nation's successors or millennials. But that the progress in the field of information technology brings positive good for the people but shifted the positive benefits due to the lack of a strong understanding of the nation's morality on the basis of Pancasila that should be owned by millennials. From the conclusion that can be drawn from this study that the advancement of information technology has an effect on the lifestyle and way of thinking of millennials so that it becomes a threat to the sustainability of local culture, therefore millennials as the next generation and savior of the nation should be equipped with an understanding of the nation's morality on the basis of Pancasila and its implementation in order to foster nationalism and realize the nation's strategy in overcoming degradation of local culture.

Information and Communication Technology is growing rapidly in the world's competition. This flow of development brings a big influence for its users including millennials who live in urban areas that always boast a western lifestyle culture that is reflected by the behavior of money-wasting habits that it has or called hedonism. This certainly causes the threat of degradation to the culture of local heritage that should be maintained by the nation's successors or millennials. But that the progress in the field of information technology brings positive good for the people but shifted the positive benefits due to the lack of a strong understanding of the nation's morality on the basis of Pancasila that should be owned by millennials. From the conclusion that can be drawn from this study that the advancement of information technology has an effect on the lifestyle and way of thinking of millennials so that it becomes a threat to the sustainability of local culture, therefore millennials as the next generation and savior of the nation should be equipped with an understanding of the nation's morality on the basis of Pancasila and its implementation in order to foster nationalism and realize the nation's strategy in overcoming degradation of local culture