Table 1.

Characteristics of included studies.

Author	Year	Country	Study design	N (analysis)	Population description	Social media platform
Firth	2017	United States	Randomized controlled trial	39	Undergraduate and graduate students	Facebook
Greer	2019	United States	Randomized controlled trial	45	Young adults (age 18–29 years) within 5 years of completing active cancer treatment	Facebook
Watkins	2020	United States	Quasi-experimental, pre-post design	40	Black men with self-reported anxiety or depression symptoms	Facebook
Yu	2020	Taiwan	Randomized controlled trial	136	College students recruited	Facebook
Pailler	2020	United States	Exploratory mixed-methods cohort study	29	Adolescent and young adult cancer patients (17–36)	Pixtori
Asbury	2018	United States	Randomized controlled trial	51	University women (and their friends/family)	Built network
Radovic	2018	United States	Non-randomized pre-post trial	57	Adolescents and young adults (aged 14–26 years) with a self-reported history of depressive and/or anxiety symptoms	Built network/blog
Karim	2021	United States	Non-randomized pre-post trial	34	Adolescents and young adults who self-report symptoms of depression and anxiety	Built network/blog
Ludwig	2019	United States	Non-randomized pre-post trial	26	Young people with schizophrenia spectrum disorder	Built network/MOST
Alvarez-Jimenez	2018	Australia	Uncontrolled pilot study	14	Young people at ultra-high risk for psychosis	Built network/MOST
Rice	2018	Australia	Non-randomized pre-post trial	42	Young people with depression	Built network/MOST
McEnery	2019	Australia	Non-randomized pre-post trial	10	Youth with first-episode psychosis (FEP) w/ social anxiety	Built network/MOST
Alvarez-Jimenez	2020	Australia	Uncontrolled, single-group design	93	AYAs with mental health conditions	Built network/MOST
Bailey	2020	Australia	Non-randomized pre-post trial	20	Young adult patients w/ recent suicidal ideation	Built network/MOST
Rice	2020	Australia	Uncontrolled pre-post design	76	Young people with social anxiety	Built network/MOST
Firth	2017	United States	Randomized controlled trial	39	Undergraduate and graduate students	Facebook
Greer	2019	United States	Randomized controlled trial	45	Young adults (age 18–29 years) within 5 years of completing active cancer treatment	Facebook
Watkins	2020	United States	Quasi-experimental, pre-post design	40	Black men with self-reported anxiety or depression symptoms	Facebook
Yu	2020	Taiwan	Randomized controlled trial	136	College students recruited	Facebook
Pailler	2020	United States	Exploratory mixed-methods cohort study	29	Adolescent and young adult cancer patients (17–36)	Pixtori
Asbury	2018	United States	Randomized controlled trial	51	University women (and their friends/family)	Built network
Radovic	2018	United States	Non-randomized pre-post trial	57	Adolescents and young adults (aged 14–26 years) with a self-reported history of depressive and/or anxiety symptoms	Built network/blog
Karim	2021	United States	Non-randomized pre-post trial	34	Adolescents and young adults who self-report symptoms of depression and anxiety	Built network/blog
Ludwig	2019	United States	Non-randomized pre-post trial	26	Young people with schizophrenia spectrum disorder	Built network/MOST
Alvarez-Jimenez	2018	Australia	Uncontrolled pilot study	14	Young people at ultra-high risk for psychosis	Built network/MOST
Rice	2018	Australia	Non-randomized pre-post trial	42	Young people with depression	Built network/MOST
McEnery	2019	Australia	Non-randomized pre-post trial	10	Youth with first-episode psychosis (FEP) w/ social anxiety	Built network/MOST
Alvarez-Jimenez	2020	Australia	Uncontrolled, single-group design	93	AYAs with mental health conditions	Built network/MOST
Bailey	2020	Australia	Non-randomized pre-post trial	20	Young adult patients w/ recent suicidal ideation	Built network/MOST
Rice	2020	Australia	Uncontrolled pre-post design	76	Young people with social anxiety	Built network/MOST