Participants
Jakarta-based
A Jakarta-based research agency recruited and enrolled a sample of adolescent girls and young Indonesian women from 10 cities across the western, central, and eastern regions of Indonesia (Balikpapan, Bandung, Jakarta, Makassar, Manado, Medan, Palembang, Pontianak, Semarang, and Surabaya) offline, evenly split across age and socioeconomic status. Adolescent girls and young women were invited to participate if they met the following inclusion criteria: (1) were between the ages of 15 and 19 years, (2) had their own mobile phone, and (3) visited Facebook or Instagram daily. They were excluded from the study if they (1) followed the Girl Effect brand (Springster) on social media, (2) had previously accessed the Springster website, or (3) did not provide written consent from a parent or guardian (if they were aged <18 years).The research agency recruited participants via phone using an existing database of previous adult participants aged >40 years. Individuals who had a daughter aged between 15 and 17 years were read the parental information sheet. If they had >1 eligible daughter, only one who met the needs of this trial’s age quota was selected; if >1 met the age quota needs, the daughter whose date of birth was closest to the date of the call was selected. Parents who provided verbal consent then supplied information regarding their socioeconomic status. Daughters were then screened by the recruiter to determine if they met the social media use inclusion criteria and whether they had previously accessed the Springster brand on social media and its website (exclusion criteria). If she provided verbal assent to participate, parents once again provided consent for their daughter’s participation, this time written via WhatsApp. A similar process was executed for eligible daughters aged 18 or 19 years, except that they themselves provided verbal and written consent. The identities of the parents and eligible daughters were confirmed on video calls through official photo-based IDs.