Cross-Platform Social Media Publishing System: A Unified Social Media Automation and Scheduling Platform

The rapid proliferation of social media platforms has created a significant operational burden for businesses, digital marketers, and content creators who must manage simultaneous publishing across multiple services. Manual cross-platform distribution is repetitive, error-prone, and inefficient. This paper presents the design and implementation of a Cross-Platform Social Media Publishing System — a lightweight, web-based automation platform that enables centralised content management and one-click simultaneous publishing to Instagram, Facebook, and LinkedIn. The system employs a FastAPI asynchronous backend, JSON Web Token (JWT) authentication conforming to RFC 7519, AES-256-CBC encrypted credential storage, RESTful API integration with platform-specific adapters, and a SQLAlchemy ORM over SQLite/PostgreSQL. Functional evaluation indicates that the system successfully eliminates redundant cross-platform operations and measurably improves publishing workflow efficiency. Scheduled posting, AI-driven caption generation, and analytics integration are identified as future enhancements.