Conceptualized upon interrelated theories, social identity and cultural identity, this study explored the identities of a foreigner as she acculturated in China. Data were collected from WeChat, the most popular social networking site in China; 135 WeChat Moments posts of one foreign English teacher from America were analyzed as they displayed identity formation: personal interests and needs, occupation, family (life), Chinese themes and American themes. Posts were further analyzed in terms of personal identity and intercultural identity. While the participant continued to display an “American” identity, she also portrayed and described experiences of Chinese culture, evident in posts about Chinese traditions, contrasts between American and Chinese culture, and usage of Chinese characters. Overall, anxiety and stress were not strongly evident in the participant’s acculturation process, and most posts indicated active and ongoing adaptation to Chinese culture.