This research aims to examine the influence of the Mobile Legend game and social media on changes in the use of Indonesian among teenagers. Using an online survey method with a quantitative and qualitative approach, data was obtained from a survey of 34 teenagers aged 12-21 years. The research results showed that as many as 47.05% of respondents felt that playing Mobile Legends made them use harsh language more often, both when playing games and in daily interactions with friends or family. As many as 47.05% of respondents stated that they often used harsh language. slang and abbreviations in daily conversations, as many as 42.6% of respondents are aware of maintaining a balance between the use of slang and standard language. As many as 29.4% of respondents feel more comfortable and use slang more often due to the influence of social media. This research concludes that the Mobile Legend game and social media have a significant influence on the use of informal language and foreign terms among teenagers, which has an impact on their ability to speak formal language.
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