Not sure if you've gotten the solution.

I was also on the hunt for a similar solution for some of the smaller brands I help manage.
Ended up with self hosted AI solutions.

You can automate reactions and custom comments on Facebook, Instagram, and Twitter for free using open-source tools and free AI models. For Facebook, use the Meta Graph API with n8n, a self-hosted automation tool. Create a free Meta developer app to get an API token, let n8n check for new posts on selected pages, then trigger reactions and comments from a prewritten or AI-generated bank within Facebook’s limits.

On Instagram, use Instaloader to pull new posts from target accounts. Pass them to a local AI model like LLaMA 3 via Ollama to generate natural comments from a style bank. Post them back using your Instagram session token in n8n. Keep IP and location consistent to avoid automation detection.

For Twitter, use the free tier of Twitter API v2 with n8n or Pipedream. Monitor tweets from chosen accounts, send them to Hugging Face’s free Inference API for AI-generated comments, and post replies automatically.

Link these workflows in one n8n dashboard so all platforms are monitored and responded to from a single place. This avoids subscription costs by using local AI or free API allowances, with the only investment being initial setup time.


Just necro'd the old thread in case anyone finds my method useful.