Generate Viral Facebook Posts with Gemini 2.0 & AI Image Generation

🚀 AI Facebook Post Generator - Complete Setup Guide

> Transform your content ideas into viral Facebook posts with AI-powered automation in just 30 minutes!

📋 Prerequisites Checklist

What you'll need before we start:

✅ n8n instance (cloud or self-hosted) ✅ Facebook Business Page (not personal profile) ✅ Google account with Sheets & Gmail access ✅ Basic understanding of API credentials

⏱️ Estimated Setup Time: 30-45 minutes
🎯 Difficulty Level: Intermediate
💰 Cost: Free tier available for all services

🎨 What You'll Build

By the end of this guide, you'll have:

📝 Smart Content Form - Web form that captures your ideas 🤖 AI Content Optimizer - Gemini AI that polishes your writing 🖼️ Auto Image Generator - Custom visuals created automatically 📊 Content Tracker - Google Sheets logging for analytics 📱 Facebook Publisher - Direct posting to your page 📧 Success Notifications - Email confirmations with post links

🔧 Step-by-Step Setup

Step 1: 📘 Facebook Integration Setup

🔸 1.1 Create Your Facebook App

Why this matters: This gives your workflow permission to post on your behalf.

Navigate to Facebook Developers 🌐 Click "My Apps" → "Create App" Select "Business" as your app type App Name: AI-Content-Poster (or your preferred name) Hit "Create App"

> 💡 Pro Tip: Choose a descriptive name - you'll see this in your Facebook activity logs

🔸 1.2 Configure App Settings

In your app dashboard: "Add a Product" Find "Facebook Login" → "Set Up" Navigate to Settings → Basic App Domains: Add app.n8n.cloud (for n8n cloud users) Save changes ✅

🔸 1.3 Generate Your Page Access Token

This is the key that unlocks posting powers! 🔑

Go to Tools → Graph API Explorer Select your newly created app Click "Generate Access Token" Required Permissions: pages_manage_posts pages_read_engagement pages_show_list Select your target Facebook page Copy the token (starts with EAAG...)

⚠️ Critical Step - Make Token Long-Lived: In Graph API Explorer, make a GET request to: /oauth/access_token?grant_type=fb_exchange_token&client_id=YOUR_APP_ID&client_secret=YOUR_APP_SECRET&fb_exchange_token=YOUR_SHORT_TOKEN

🔸 1.4 Find Your Page ID

Two methods to get your Page ID:

Method 1 - Direct from Facebook: Visit your Facebook page Click "About" tab Scroll to find "Page ID"

Method 2 - API Explorer: Use Graph API Explorer GET request to: /me/accounts Find your page in the response

Step 2: 🔍 Google Services Setup

🔸 2.1 Enable Required APIs

Setting up your Google Cloud foundation:

Visit Google Cloud Console ☁️ Create new project or select existing "APIs & Services" → "Library" Enable these APIs: ✅ Google Sheets API ✅ Gmail API
✅ Google Drive API (optional)

🔸 2.2 Create Service Account

This creates a "robot" account for automated access:

"APIs & Services" → "Credentials" "Create Credentials" → "Service Account" Name: ai-facebook-automation "Create and Continue" Skip role assignment → "Continue" "Done" ✅

🔸 2.3 Download Credentials File

Click your service account email "Keys" tab → "Add Key" → "Create New Key" Choose "JSON" format Download and save securely 📁

> 🔒 Security Note: This file contains sensitive credentials. Store it safely!

🔸 2.4 Prepare Your Google Sheets

Create your data tracking system:

📊 Sheet 1: Content Log Purpose:** Track all generated content Columns:** A: Date (Ngày) B: Short Content (Nội dung ngắn)
C: Full Content (Nội dung đầy đủ)

📝 Sheet 2: Input Tracking Purpose:** Log form submissions Columns:** A: Date B: Time C: Content

🔗 Important: Share both sheets with your service account email (found in the JSON file)

Step 3: 🤖 AI Services Configuration

🔸 3.1 Get Your Gemini API Key

Power up your AI content generation:

Head to Google AI Studio 🎨 Sign in with Google account "Create API Key" Copy the key (starts with AIza...)

> 💰 Cost Info: Gemini offers generous free tier limits - perfect for getting started!

Step 4: ⚙️ n8n Workflow Configuration

🔸 4.1 Import the Magic ✨

Copy the workflow JSON from the template In n8n: "Import from JSON" Paste the workflow code "Import" to load your new automation

🔸 4.2 Configure Your Credentials

🔑 Facebook Graph API Setup: Settings → Credentials → "Add Credential" Search: "Facebook Graph API" Access Token: Your Page Access Token from Step 1.3 Test connection → Save as: Facebook Page Access

🔍 Google Services Setup: "Add Credential" → "Google Service Account" Upload your JSON file from Step 2.3 Test connection → Save as: Google Services

🧠 Gemini AI Setup: "Add Credential" → "Google PaLM API" Enter your Gemini key from Step 3.1 Save as: Gemini AI

🔸 4.3 Customize Node Settings

📱 Update Facebook Configuration:

In "Facebook Graph API" node: Replace "113732581629527" with your Page ID from Step 1.4

In "Facebook Upload Img" node: Replace "113732581629527" with your Page ID from Step 1.4

📊 Update Google Sheets:

In "save content" node: Replace Document ID with your Content Log Sheet ID

In "Append row in sheet" node: Replace Document ID with your Input Tracking Sheet ID

> 💡 Finding Sheet ID: It's the long string in your Google Sheets URL after /spreadsheets/d/

📧 Update Notification Email:

In "Send a message" node: Replace xxx@gmail.com with your email address Configure Gmail credentials

Step 5: 🧪 Testing & Validation

🔸 5.1 Component Testing

📊 Test Google Sheets Connection: Right-click "Append row in sheet" node "Execute Node" ✅ Verify test row appears in your sheet

🤖 Test Gemini AI: Right-click "Basic LLM Chain" node "Edit Input Data" → Add test content Execute → ✅ Verify AI response quality

🖼️ Test Image Generation: Right-click "HTTP Request" node Ensure valid prompt from previous step Execute → ✅ Check for base64 image data

📱 Test Facebook Upload: Run full workflow with test content ✅ Check your Facebook page for new post ✅ Verify image uploaded correctly

🔸 5.2 End-to-End Victory Test 🎉

"Execute Workflow" on trigger node Submit test content through the form Monitor each node execution 🎊 Celebrate your first AI-generated post!

🎯 Success Indicators

Your setup is complete when you see:

✅ Form accepts and processes content ✅ AI generates optimized text + image prompt
✅ Custom image appears in Facebook post ✅ Content logged in Google Sheets ✅ Success email in your inbox ✅ Professional-looking post on your Facebook page

🚨 Troubleshooting Quick Fixes

Facebook Issues Token Expired?** → Generate new long-lived token Permission Denied?** → Check page admin rights Invalid Page ID?** → Double-check Page ID format

Google Sheets Problems
403 Forbidden?** → Share sheet with service account Sheet Not Found?** → Verify Sheet ID in URL Column Errors?** → Match exact column names

AI Content Issues Empty Responses?** → Check Gemini API quotas Poor Quality?** → Adjust AI prompts JSON Errors?** → Validate parsing logic

🎨 Customization Ideas

Make it uniquely yours:

🎨 Brand Voice: Adjust AI prompts for your tone ⏰ Scheduling: Add time delays for strategic posting 📈 Analytics: Connect performance tracking tools 🔄 Multi-Platform: Extend to Instagram, LinkedIn 👥 Team Features: Add approval workflows

🎉 You Did It!

Congratulations! You've built an AI-powered content machine that will save you hours every week.

What's Next? Test with different content types Monitor performance in Google Sheets Refine AI prompts for better results Share your success with the community!

Need Help? 🤝 Join n8n Discord Visit Community Forum Check n8n Documentation

Ready to revolutionize your content creation? Your AI assistant is waiting! 🚀