work has examined peer selection and socialization within romantic relationships (Simon, Aikins, & Prinstein, 2008) and sibling relationships (Stormshak, Comeau, & Shepard, 2004; van der Vorst, Engels, Meeus, Dekovic, & Van Leeuwe, 2007). In addition, research has begun to reflect findings on adolescent friendship suggesting that most dyadic relationships are nested within larger networks, or cliques, of friendships. The recent availability of sophisticated quantitative tools such as social network analysis also has allowed for a more thorough study of these cliques and the peer influence processes that may occur within them (e.g., Burk, Steglich, & Snijders, 2007; Laursen et al., 2008).
