Cross-Platform Social Auto-Post Tool

I want a small, reliable program that can publish the same content to Facebook, Instagram and Twitter from one place. The core flow is simple: I set the message (text, image or video), choose a date-time or immediate send, click once, and the tool handles login and posting in the background. A lightweight dashboard or command-line interface is fine as long as it is easy to configure accounts and see basic status logs.

Tech stack is open—feel free to suggest Python + Selenium, Node with official APIs, or any framework you know will survive platform policy changes. Whatever you choose, I will need:

• Source code and brief setup notes
• A short test run showing one post pushed to all three platforms
• Clear instructions on how to add additional accounts later

When you respond, show related past work only; videos, screenshots or a live demo link that proves you have already automated at least one of these networks will move you to the top of the list.