Penelitian ini mempelajari mengenai bagaimana karakteristik ragam bahasa yang terdapat dalam diskusi di tiga thread forum online "Das Kinder- und Jugendforum" berdasarkan teori ragam bahasa lisan dan tulis, bahasa komunikasi di internet, dan koherensi teks. Penelitian dilakukan dengan menggunakan metode kualitatif dan dengan teknik deskriptif-analitis. Hasil dari penelitian menunjukkan penemuan tiga karakteristik yang ada pada ragam bahasa lisan, tulis, laras bahasa dalam komunikasi di internet, serta menunjukkan bahwa teks berupa percakapan diskusi dalam forum online ini memenuhi syarat koherensi teks. Meskipun ditemukan penyimpangan koherensi tematik, namun komunikasi masih dapat berjalan lancar.This research analyzes the characteristics of language variation found in three threads of the online forum discussion "Das Kinder- und Jugendforum" based on the three theories, which are: spoken and written language, The chatting‟s language in the internet, and text coherence. The research is conducted by using qualitative method combined with analytical descriptive technique. The result of this research shows that there are combinations of language variations used in spoken, written, and internet chatting. It also shows that the text, in form of discussion conversation in this online forum, fulfil the requirement of text coherence. Moreover, even though divergence of thematic coherence are found, communication still works well because the divergence is a form of theme expansion.