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Generate Viral Facebook Posts with Gemini 2.0 & AI Image Generation

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Created by: Charles || charlesnguyen

Charles

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Last update 22 days ago

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🚀 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.

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

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

🔸 1.2 Configure App Settings

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

🔸 1.3 Generate Your Page Access Token

This is the key that unlocks posting powers! 🔑

  1. Go to Tools → Graph API Explorer
  2. Select your newly created app
  3. Click "Generate Access Token"
  4. Required Permissions:
    • pages_manage_posts
    • pages_read_engagement
    • pages_show_list
  5. Select your target Facebook page
  6. 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:

  1. Visit your Facebook page
  2. Click "About" tab
  3. Scroll to find "Page ID"

Method 2 - API Explorer:

  1. Use Graph API Explorer
  2. GET request to: /me/accounts
  3. Find your page in the response

Step 2: 🔍 Google Services Setup

🔸 2.1 Enable Required APIs

Setting up your Google Cloud foundation:

  1. Visit Google Cloud Console ☁️
  2. Create new project or select existing
  3. "APIs & Services" → "Library"
  4. 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:

  1. "APIs & Services" → "Credentials"
  2. "Create Credentials" → "Service Account"
  3. Name: ai-facebook-automation
  4. "Create and Continue"
  5. Skip role assignment → "Continue"
  6. "Done" ✅

🔸 2.3 Download Credentials File

  1. Click your service account email
  2. "Keys" tab → "Add Key" → "Create New Key"
  3. Choose "JSON" format
  4. 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:

  1. Head to Google AI Studio 🎨
  2. Sign in with Google account
  3. "Create API Key"
  4. 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 ✨

  1. Copy the workflow JSON from the template
  2. In n8n: "Import from JSON"
  3. Paste the workflow code
  4. "Import" to load your new automation

🔸 4.2 Configure Your Credentials

🔑 Facebook Graph API Setup:

  1. Settings → Credentials → "Add Credential"
  2. Search: "Facebook Graph API"
  3. Access Token: Your Page Access Token from Step 1.3
  4. Test connection → Save as: Facebook Page Access

🔍 Google Services Setup:

  1. "Add Credential" → "Google Service Account"
  2. Upload your JSON file from Step 2.3
  3. Test connection → Save as: Google Services

🧠 Gemini AI Setup:

  1. "Add Credential" → "Google PaLM API"
  2. Enter your Gemini key from Step 3.1
  3. 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:

Step 5: 🧪 Testing & Validation

🔸 5.1 Component Testing

📊 Test Google Sheets Connection:

  1. Right-click "Append row in sheet" node
  2. "Execute Node"
  3. ✅ Verify test row appears in your sheet

🤖 Test Gemini AI:

  1. Right-click "Basic LLM Chain" node
  2. "Edit Input Data" → Add test content
  3. Execute → ✅ Verify AI response quality

🖼️ Test Image Generation:

  1. Right-click "HTTP Request" node
  2. Ensure valid prompt from previous step
  3. Execute → ✅ Check for base64 image data

📱 Test Facebook Upload:

  1. Run full workflow with test content
  2. ✅ Check your Facebook page for new post
  3. ✅ Verify image uploaded correctly

🔸 5.2 End-to-End Victory Test 🎉

  1. "Execute Workflow" on trigger node
  2. Submit test content through the form
  3. Monitor each node execution
  4. 🎊 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? 🤝

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