The purpose of this study is to present the distinctive writing styles for SNS mobile texts and describe the use of the languages in Korean mobile texts. For the data, we collected emoticons, abbreviations, acronyms, punctuation marks, omitted letters and nonstandard spellings proved to be observable in Korean SNS mobile texts. Nonstandard orthography, emoticons and punctuation marks were much more frequently used by females than by males. A difference by generation was found in text length; generally, texts written by old generations were longer than those by young generations. Especially acronyms, which are written by only consonants, were much more frequent in young generations than in old ones. We have also identified a link between the frequency of nonstandard orthography and age. The younger writers of mobile texts are, the more frequently nonstandard spellings and acronyms are used.