AI 中文总结
本研究提出Outer Limits系统，可在旧版Reddit界面内开展受控内容实验，经219人研究验证其感知保真度达标，兼具内容控制、现有界面及隔离实验内容的特性。
AI 中文摘要
独立研究人员往往缺乏对活跃社交媒体平台开展受控实验的干预能力。我们提出Outer Limits，这是一个基于浏览器的系统，用于在现有旧版Reddit界面内开展受控内容实验，而非在重构的模拟环境中进行。该系统在本地渲染内容，记录研究事件，并包含配置好的投票和评论操作，确保构建的内容或实验写入交互不会传到Reddit平台。在一项有219名参与者的感知保真度研究中，ART方差分析未发现显著的帖子类型、参与者意识或交互效应；探索性TOST检验达到了边际对比以及预先知情亚组内帖子类型的d=±0.50等效准则。我们还通过一项改变帖子框架、评论框架和评论立场的因子实验示例展示了该系统。Outer Limits具备本文所考虑方法分别提供的三个特性：对实验内容的精确控制、现有平台界面，以及将实验内容与交互与宿主社区隔离。
英文摘要
Independent researchers often lack access to intervention capabilities for controlled experiments on live social media platforms. We present Outer Limits, a browser-based system for controlled content experiments within the existing Old Reddit interface, rather than in a reconstructed simulation. The system renders content locally, records study events, and contains configured voting and commenting actions so that neither constructed content nor experimental write interactions reach Reddit. In a 219-participant perceptual-fidelity study, ART ANOVAs found no significant Post Type, Participant Awareness, or interaction effects. Exploratory TOSTs met the d = plus-minus 0.50 equivalence criterion for the marginal contrasts and for Post Type within the forewarned subgroup. We also illustrate the system with a factorial study varying post frame, comment frame, and comment stance. Outer Limits combines three properties that the approaches considered here provide separately: precise control over experimental content, an existing platform interface, and containment of experimental content and interactions from the host community.
