Abstract Youth and language are two inseparable things. In communication, youth usually have their way of communication. In form of written communication, youth mostly use code-mixing, especially in social media. Based on this phenomenon, this research attempts to analyze 20 posts by South Jakartan Youth on Twitter from September to October 2018 that contained code-mixing. The writer applied qualitative research and the theory of code-mixing by Mckay and Nancy. In those posts on Twitter by South Jakartan youth, the writer found three forms of codemixing; insertions, phrases insertions, and sentence insertions.
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