With the popularity of social media and mobile networks, the explanatory power for online identity of the traditional theory of the self and social identity theory are fall further. What is the theoretical basis of mobile internet identity become the important theories in the study of network communication. This paper placed mobile internt identity on the macroscopic background of individual society, using theory of "the stranger" in the post modern process of European sociology to discuss the basis of re-embeddedment to individual society for individual while they dis-embedded from the early modern society. The tensions between the individual and social integration, diversity and social identity are emerged in the internet society and strangers as the basis of mobile internet identity also are emerged and play the key role in the individual society.