This article presents a case study that examines how an online social networking community is constituted through intercultural discourse on the part of one learner sojourning in the US. Using Byram's model of intercultural communicative competence, this study examines the learner's naturalistic communication in a social networking site (SNS). The qualitative analysis indicates that the learner acted upon the affordances of SNSs to reflect on her intercultural experiences and displayed evidence of intercultural understanding during her study abroad years. The learner's intercultural knowledge, attitudes, and discovery are shown to be co-constructed by her and other members in the online discourse. This study indicates that computer-mediated communities like SNSs provide the learner with a space in which she documented her cultural experience and reflected on those experiences in real-time exchanges with multilingual, multicultural users. Pedagogical implications are discussed.