“…Once the friendship has formed, these similarities may be reinforced through socialization processes occurring between the individuals (Altermatt & Pomerantz, 2003;Hartup, 1989;Kandel, 1978). During adolescence, friends tend to share common social and behavioral characteristics, such as academic success and motivation, dropout rates, teen pregnancy rates, externalizing problems such as aggression, delinquency or drug use, internalizing problems and body image issues (Cairns, Cairns, Neckerman, Gest, & Gariépy, 1988;Carey, Donaghue, & Broderick, 2013;Cillessen & Borch, 2008;Kistner, Balthazor, Risi, & Burton, 1999;Rubin, Bukowski, & Parker, 2006;Urberg, Değirmencioğlu, & Pilgrim, 1997). In other words, adolescents choose their peers according to preexisting characteristics (selection process), and over time their resemblance with these chosen peers may increase and influence their ulterior adjustment (socialization).…”