n8n AI Workflow: Auto-Post Gemini Images to Facebook (Pollinations)

Auto-Post Fresh AI Images to Your Facebook Page—3 Times Daily with n8n, Gemini, and Pollinations

This n8n AI workflow automatically generates imaginative AI image prompts with Google Gemini, renders unique artwork through Pollinations AI, and publishes the results to your Facebook Page at 7:00, 11:00, and 17:00 (local time)—including hashtags and a clean caption.

What this workflow does

• Schedules posts using the n8n Schedule Trigger (3x daily at 7:00, 11:00, 17:00).
• Generates random image prompts in a chosen style (retro-futuristic, cinematic, or surreal) using Google Gemini via LangChain.
• Fetches images from Pollinations AI by sending custom prompts to the Pollinations API (no auth required).
• Publishes to Facebook automatically using the Facebook Graph API, posting the image with hashtags and a clean caption.

Use cases

• AI artists who want consistent posting without manually prompting, rendering, and uploading.
• Facebook Page managers who need repeatable creative content schedules for engagement.
• Digital marketers testing different creative themes by adjusting the Gemini prompt style.

Technical details

• n8n setup: designed for n8n self-hosted or desktop use (uses a schedule trigger).
• Integrations: Google Gemini API Key (via LangChain), Pollinations API (no auth), and Facebook Graph API.
• Facebook token scopes: pages_manage_posts, pages_read_engagement, pages_show_list.
• Nodes/blocks: Code, Sticky Note, HTTP Request, Schedule Trigger, Facebook Graph API, and LangChain (Basic LLM Chain) for prompt generation.

How to customize

• Change the style by updating the Basic LLM Chain node promptType in the “define” section.
• Adjust the Set The Generator Image settings for image width/height, seed randomness, and Pollinations model parameters (e.g., &model=kontext).
• Add cross-posting nodes (e.g., Telegram/Twitter) if you want broader distribution.