ke they do, some people may not understand what they are talking about. Some may be know that its including to linguistics phenomenon. Some may be understand about code switcing, code mixing, interference, and many other. But, the general people even the students of English Departmen may do not know how to different between Code Mixing, Code Switcing and interference. According to Chaer on his book Sosiolinguistik Perkenalan Awal (2004: 114), “Pembicaraan mengenai alih kode biasanya diikuti dengan pembicaraan mengenai campur kode. Kedua peristiwa yang lazim terjadi di masyarakat bilingual ini mempunyai kesamaan yang besar, sehingga seringkali sukar dibedakan.”
The similiarity of code switching and code mixing is on the using of two languages or more. But clearly, we can diferent it by looking the context. According to Wardhaugh (2006: 103), “Code mixing occurs when conversant use both of languages together to the extent that they change from one language to the other in the course of single utterance.” It can be said that the languages that used on code switcing phenomenon still have each own autonomy function, doing by consciously with certain factors. While on code mixing, there is main code that has its own autonomy and function, while the other code just a piece without a function. While the different of code switching and interference lays in its reference. Code switching refers to the use of other language beside our mother language on communicating, and interference refers to the deviation of using another language on communicating as a fault. Still according to Chaer (2004: 124), “Interference adalah perubahan system suatu bahasa sehubungan dengan adanya persentuhan bahasa tersebut dengan unsure-unsur bahasa lain yang dilakukan oleh penutur yang bilingual.” In this research, it will be investigated more deeply about the phenomenon of code switching getting loose from the other phenomenon such as code mixing and interference. Someone may have the reason why they switch their mother language to the other language, in this case is Bahasa Indonesia into English. The type of code switching they used also may be variant. The type of code switching they used may depend on the reason or the factor of the code switching they have.
It is interesting to see how the code switching use by the bilinguals on their facebook comments is. The users may have reasons why they switch their Bahasa Indonesia into English when they write the comments. Then, the researcher is challenged to conduct a research about the code switching found in facebook comments. Then, the researcher explore it on a paper entitled “Code Switching on Facebook Comments (An Analysis of Types and Reasons of Code Switching Written by the 8th Semester Students of English Department)”
B. Statement of Problems
The phenomenon of code switching has become an interesting topic to be discussed, especially code switching found in facebook comments. Since this social network appears at 2004, it has large members, and it may lead the members that are mostly teenagers, including the students of English Department as the learners of English as Foreign Language to begin imitating the way they communicate to each other. Getting loose from the reasons why they are choosing facebook to communicate one each other, in their daily day, they seems cannot stop to be exist on facebook. Most of them use facebook as media to communicate one to each other. They, who has Bahasa Indonesia as their first language and English as another language they study in depth, often switch their first language into English when they writing comments on facebook. This phenomenon called as Code Switching. Considering the phenomena of code switching doing by the Learners of English as Foreign Language, especially the students of English Department that broadly appears on facebook, this research is conducted to observe this phenomenon more deeply. This research specifically observes the code switching written by the 8th semester students of English Department of Adab and Humanity Faculty of Sunan Gunung D