The Social Media Hacker List repository primarily maintains a curated markdown list of tools and applications for enhancing social media experiences across various platforms (Facebook, Instagram, Twitter, etc.). The list is organized by platform and includes entries such as alternative clients, analytics tools, bots, and content creation utilities. Each entry is manually curated and must meet specific inclusion criteria, such as being created by unaffiliated developers and having recent activity. To ensure the list remains accurate and free of broken or inactive links, the repository includes a Rust-based URL checker application. This tool is executed weekly via a GitHub Actions workflow (check.yaml) to validate every URL in the README.md. For standard URLs, it performs HEAD and GET requests, treating certain HTTP status codes as success (200, 403, 406) with special handling for known edge cases (e.g., 502 for reddit.com, 429 for apps.apple.com). For GitHub repository URLs, it uses the GitHub API to check if the repository is archived or has not been pushed to in the last 365 days, flagging such entries as invalid. The checker application is designed as a standalone, concurrent command-line tool. It reads input from stdin, extracts URLs using a regular expression, and processes them asynchronously with the tokio runtime. The application is containerized via a multi-stage Dockerfile and published to GitHub Container Registry through another workflow (publish.yaml), allowing it to be reused in other contexts. The code demonstrates solid Rust practices, including proper error handling, asynchronous I/O, and modular function design, making its core URL and GitHub checking logic potentially reusable in other projects with minimal adaptation.