Social presence has interested scholars for decades.It can be viewed as a subcomponent of a broader discussion of presence. In a widely used classification,Lombard and Ditton(1997) divide presence into six dimensions,of which one is called presence as social richness. According to this dimension, people evaluate the capabilities of a medium to convey social presence. This dimension defines social presence as the extent to which a medium is perceived as warm, sociable, personal, or intimate when used to communicate with someone else.