Mobile social activities are among the most popular forms of socialization today, and has become an integral part of people's daily lives. With advances in technology and the rise of affordable virtual reality devices, VR social interaction through avatar creation and support for advanced body tracking capabilities has the potential to lead the next revolution in the digitization of social activities. However, whether in VR or on mobile phones, user politeness and friendliness are always crucial factors influencing the user experience of social applications. While past research has examined online politeness, less attention has been paid to comparing politeness perceptions between social VR and mobile applications. In the meantime, given that the core characteristics of VR socializing is its heightened sense of presence, research by many scholars in the relevant field also indicates that presence often positively correlates with positive emotions. Therefore, this study will explore how people perceive and express verbal and non-verbal politeness behaviors in different social applications (VR chat, Soul app), as well as investigate how the sense of presence provided by the devices influences people's expression of politeness. The study's results identified the polite and impolite behaviors that people had perceived in VR and the mobile App. Lastly, the study also reported that VR applications that offer a heightened sense of presence can better facilitate politeness.