Code Mixing is a case where a speaker uses lexical items and grammatical features of two or more languages in a sentence. As the consequence of modernization, code mixing phenomena could be found easily not only in real life communication, but also in social media. This study specifically analyzed the code mixing produced by an Indonesian Social Media Influencer in reviewing skincare products form a local brand. The aims of this research are revealing the types of code mixing and the reasons of code mixing done by the influencer. The data are taken from a Youtube video uploaded by the influencer. This research employs descriptive qualitative approach. Moreover, an interview is conducted to gain in-depth information of the possible reasons of the use of code mixing from the influencer’s perspective. The result of this study found that there are three types of code mixing used by the influencer, namely intra-sentential code mixing, intra-lexical code mixing, and involvement in a change of pronunciation. Besides, the reasons of code mixing found in this study are due to talking about particular topic, being emphatic about something, interjection, expressing solidarity and to soften a request. In addition, from the result of the interview, it is found that the influencer used code mixing due to globalization, unpopular term, and prestige.

Keywords: Code Mixing, Social Media, Influencer, Review Text, Hoffman Theory.