How is social media reshaping architecture? What can platforms like Instagram, Twitch, Pinterest, and TikTok tell us about the spaces we inhabit? The Interiors of Social Media is the first book to explore the relationship between architecture, interiors, and social media, guiding us through today's digital landscape to reveal where the virtual and physical worlds meet. From influencer bedrooms and gaming setups to humanitarian shelters, pet influencer homes, and porn rooms, Javier Fernández Contreras reveals how social media does not merely depict interiors, but actively scripts new spatial types: homes that are both private and hyper-public, domestic yet performative, and material yet algorithmic. By mapping platform spatialities and tracing the themes that connect them, he examines interiors as sites of consumerism, display, and mediatization - environments that expose the ethical, political, and ecological implications of 21st-century digital culture. Drawing on architecture, media studies, and digital humanities, The Interiors of Social Media offers a critical lens on how online interactions are woven into everyday life and invites us to rethink architecture in the age of the algorithm. With contributions from Paule Perron, Michela Bassanelli, Damien Greder, Vytautas Jankauskas, and students at HEAD - Genève.