After the informant consent signature, the adolescents completed a series of self-report questionnaires on the use of SNs, on communication preferences, on social anxiety and on Covid19 impact through the online platform of LimeSurvey. 
LimeSurvey
Adolescents spent more than 2 h/day on Instagram and 1 h and half on Whatsapp, while Tik Tok use was on average 1 h/day, especially used by younger patients (r = -0.33, p = 0.023). 
Instagram
Adolescents spent more than 2 h/day on Instagram and 1 h and half on Whatsapp, while Tik Tok use was on average 1 h/day, especially used by younger patients (r = -0.33, p = 0.023). 
Whatsapp
Adolescents spent more than 2 h/day on Instagram and 1 h and half on Whatsapp, while Tik Tok use was on average 1 h/day, especially used by younger patients (r = -0.33, p = 0.023).  AYA in therapy used more Tik Tok (U = 137.50; p = 0.03), Ask/Tellonym (U = 172.50; p = 0.05) and Twitch (U = 144; p = 0.017) than those off therapy. 
Tik Tok
Males used Twitch (t45 = -2.06, p = 0.05) and Youtube (t45 = -2.18, p = 0.03) for longer than females.  AYA in therapy used more Tik Tok (U = 137.50; p = 0.03), Ask/Tellonym (U = 172.50; p = 0.05) and Twitch (U = 144; p = 0.017) than those off therapy. 
Twitch
Males used Twitch (t45 = -2.06, p = 0.05) and Youtube (t45 = -2.18, p = 0.03) for longer than females. 
YouTube