This research compared and contrasted WeChat and Facebook used by Chinese millennial who lived in UK through examining the quality, application and representation of the framework of “Two Level of Social Capital Analysis”. It employed digital ethnography including participated observation and semi-structured interview, which found: frstly, social media technically enabled intercultural communication between English Chinese represented a dynamic and competitive ?ow which worked beyond any other network in terms of spillover effects. Secondly, Facebook and WeChat played as specific cultural label bringing in such millennial a proposed way while using those two media platforms in the process of self-identification with complexity and fragmentation. To sum up, this study challenged the traditional concept of diaspora and maintained this group of diaspora could flexibly use different social media and imaginably participated in different virtual community which contributing their double life