Pixelfed is a free, open-source image-sharing platform that runs on a federated (ActivityPub) network. It works like a decentralized Instagram, allowing users to host or join independent servers. According to available information, Pixelfed is ad-free and community-driven. The official site did not provide detailed info (and required scripts to view), so we only note that Pixelfed is intended for distributed photo sharing with privacy in mind (no centralized data, no ads).