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  1. We licensed a dataset from a mental health peer support platform catering mainly to teens and young adults. We anonymized the name of this platform to protect the individuals on our dataset. On this platform, users can post content and comment on others’ posts. Interactions are semi-anonymous: users share a photo and screen name with others. They have the option to post with their username visible or anonymously. The platform is moderated, but the ratio of moderators to posters is low (0.00007). The original dataset included over 5 million posts and 15 million comments from 2011- 2017. It was scaled to a feasible size for qualitative analysis by running a query to identify posts by a) adolescents aged 13-17 that were seeking support for b) online sexual experiences (not offline) with people they know (not strangers).