The title of this research is the Analysis of Written Words and Abbreviations in Indonesian Sentences on Social Media. Language is a tool to unite a nation without human language, it is very difficult to communicate between people. Indonesian is the National Language, sometimes without realizing it, errors in writing sentences are often encountered. In everyday life, we use Shortening words in writing so that they are fast and easier to read. The error arises because it does not use grammar that is in accordance with norms and rules, the rapid communication phenomenon today is the use of language that is supported by sophisticated technological devices, especially the language used on social networks. The use of language often occurs in writing errors. Indonesian language development. It is necessary to start from an early age, it is hoped that they will be able to have a positive attitude in speaking Indonesian properly and correctly