This study investigated the composition of the social network that the homestay offers learners in an intensive summer Arabic language program in diglossic and multilingual Tunisia and examined the types of language socialization as well as the overall linguistic and intercultural competence such opportunities present. The study specifically investigated patterns of student interaction with members of the host families and explored the degree to which students took advantage of this rich learning environment. A survey was completed by 73 students upon their return to the United States at the end of the summers of 2010-2012. Results showed that, although the social network often involved extended family members, the host mother remained the primary locus of interaction. Data also showed that the homestay offered a breadth and depth of experiences that affected students' linguistic, sociolinguistic, and cultural gains and that, postprogram, students maintained their connection to this social network via social media.