This thesis concerns the subject of social media in the internal communication, how it can function to improve the communication among the coworkers. Good Old has been the web agency of our case study, through them we have gained understanding of the phenomenon. Media and communication theories and interviews have given us the foundation of the thesis.Our conclusion shows that it is beneficial to use social media internally in the type of company that Good Old is. Furthermore, the result shows that it can improve the communication, increase organizational learning and unity among coworkers. Finally social media can make organizations more effective..