Concerns of Female Adolescents About Menarche and First Sexual Intercourse: Mixed Methods Analysis of Social Media Questions.

Background: Adolescents use social media for information on medical and social aspects of maturation.

Objective: The aim of this study was to investigate the concerns and information needs of adolescents regarding menarche and first sexual intercourse.

Methods: Questions about menarche or first sexual intercourse were obtained from Yahoo Answers, a community-based social media question-and-answer website.