We present a design framework for friendship-supportive youth social media, derived from a synthesis of five empirical studies with 331 youth participants (ages 13-25) using interviews, co-design, surveys, diary studies, and a field deployment. Iterative analysis of 209 design-relevant data points identified three pillars: Social Understanding (interaction norms, interaction cues and scaffolding, social accountability and governance), Placeness (third place and community, boundaries and personal spaces, shared presence), and Identity Alignment (identity currency, identity plurality, relational identity signals). The framework maps nine design spaces through which platforms can support the conditions under which youth friendships form, deepen, and are maintained. It offers a shared vocabulary for locating contributions, comparing design interventions, and identifying under-explored areas for future work.

翻译：我们提出一个面向青少年的友谊支持型社交媒体设计框架，该框架基于对331名青少年参与者（13-25岁）的五项实证研究的综合，这些研究采用了访谈、协同设计、问卷、日记研究和实地部署等方法。通过对209个设计相关数据点的迭代分析，我们识别出三个核心支柱：社交理解（互动规范、互动线索与支架、社交问责与治理）、场所感（第三空间与社区、边界与个人空间、共享在场感）和身份对齐（身份货币、身份多样性、关系身份信号）。该框架映射出九个设计空间，平台可通过这些空间支持青少年友谊形成、深化和维持的条件。它为定位研究贡献、比较设计干预措施以及识别未来工作中尚未充分探索的领域提供了共享词汇。