research youth internet adolescents technology hiv prevention health behavior change healthy sexuality mhealth mobile health youth internet safety survey uganda text messaging developing countries sub-saharan africa gay bisexual depression smoking cessation internet harassment online national survey lgbt mental health public health technology-based interventions adolescent men who have sex with men online focus groups sex education adolescent bullying internet use survey united states sexual behavior queer msm gay lesbian and bisexual lesbian online and offline children youth and family sexual solicitation violence harassment lgb growing up with media survey transgender health information seeking internet-based programs hiv tobacco smoking victimization pornography male teens sexual violence distress teen health and technology technology benefits participant recruitment psychosocial characteristics evaluation data comprehensive community mental health services for national online recruitment smoking participatory research young adults health coercive sex sexual health clients cell phone relationships social support quit smoking media cyberbullying perpetration natioanl sample psychological violence dating violence longitudinal data teen dating violence south africa secondary school students meeting partners online sexual orientation sexual partners sexual attraction sexual identity cross-sectional data aggression online victimization emotional distress internet safety treatment support services text messaging support services brand loyalty text-messaging intervention social media technology risks hiv information condom use sexual decision-making field work cybersenga intervention development survey design parental monitoring physical victimization discipline sexual victimization risk factors child abuse clinical abuse community mental health behavior change interventions delinquency adjudication rates cell phone ownership risky behavior yiss surveying the digital future survey cigarettes amsm methodology safer sex behaviors sex violent video games antisocial behavior positive youth development interpersonal programs imb model program risk prevalence patients support treatment middle east turkey youth development sexual risk antisocial videogames inter fam adolescence cdc media violence
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