Image DePO: Towards Gradual Decentralization of Online Social Networks using Decentralized Privacy Overlays

Centralized online social networks --- e.g., Facebook, Twitter and TikTok help drive connection on the Internet, but have nigh unfettered access to monitor monetize personal data of their users. This centralization can especially undermine use internet by minority populations, who disproportionately bear costs institutional surveillance. We introduce a new class privacy-enhancing technology decentralized privacy overlays (DePOs) that helps cOSN users regain some control over allowing them selectively share secret content cOSNs through distribution networks. As first step, we present an implementation user evaluation Image DePO, proof-of-concept design probe allows upload photos Facebook Interplanetary File System peer-to-peer protocol. qualitatively evaluated DePO in controlled, test environment with 19 queer Black, Indigenous, (and) Person Color (BIPOC) participants. found while could address threats which our participants expressed concern, interpersonal were more salient concern decisions content. Accordingly, argue order see widespread use, DePOs must align protection against abstract consider when making specific sharing decisions.