The BotolMehedi/facebook-auto-poster is a powerful PHP library. It is geared toward developers who need a flexible, cron-friendly solution.
Just pushed a new update to my repo, [Project Name]. It’s a lightweight script that automates [Task].
This Python script is a perfect starting point. It demonstrates how to use the Facebook Graph API library to post simultaneously to multiple Facebook groups. You will need to sign up for a Facebook Developer account, create an app, and generate an Access Token.