This workflow automates the creation and publishing of LinkedIn posts with AI-generated content and human approval via Slack, using Google Sheets, OpenAI (GPT-4), Slack Interactive Messages, and the LinkedIn API.

Whether you're a social media manager, content creator, or marketing professional, this workflow helps you maintain consistent LinkedIn presence and scale content creation while keeping human oversight - all managed from a simple spreadsheet.

Ideal for:

Content Marketers managing multiple LinkedIn accounts

Personal Brand Builders maintaining regular posting schedule

Agencies handling client social media presence

Teams requiring content approval workflows

File name: Linkedin Post

Main sheet structure: | ID | Linkedin Post Title | Status | Image URL |

Groups sheet structure: | GroupIds |

Add post topics and set their Status as Pending

Connect your Google account to:

Linkedin-Post-Topic (Trigger node)

OpenAI API Key → for GPT-4 content generation

Slack OAuth Token → for approval messages

LinkedIn Access Token → for posting content

HTTP Header Auth → Bearer token for LinkedIn API

Set up Slack Interactive Components webhook

Point Request URL to your N8N webhook endpoint

Enable interactive messages in Slack app

Once live, the workflow will:

Monitor spreadsheet for new topics every minute

Generate LinkedIn post using GPT-4

Send to Slack for approval/editing

Upload image to LinkedIn

Publish to profile and groups

Update spreadsheet status to Posted

Trigger: New/updated row with Pending status

Generate: AI creates engaging LinkedIn post

Approve: Slack message for review/edit

Process: Handle approval response

Upload: Register and upload image

Publish: Post to LinkedIn profile & groups

Update: Mark as Posted in sheet

Node Name Description Linkedin-Post-Topic Monitors spreadsheet for new post topics Validate-Status Filters only 'Pending' items Limit Processes one item at a time Linedin-Post-Creator Generates post content using GPT-4 Format-Content Prepares content for Slack display Approval-on-Slack Sends interactive approval message Webhook Receives Slack button responses Format-Response Extracts edited content from Slack Set-Final-Message Prepares approved content Linkedin-User-Detail Fetches LinkedIn user info Register Image Initiates LinkedIn image upload Upload Image Uploads image to LinkedIn Linkedin-post Publishes to personal profile Get-Group-id Retrieves LinkedIn group IDs Post-Linkedin-Groups Posts to multiple groups Update-Status Marks as completed in sheet

Adjust AI prompt for brand voice and hashtags

Change Slack approver or add multiple reviewers

Modify posting schedule with delay nodes

Add analytics tracking with additional API calls

Filter groups based on specific criteria

Include URL shortening for tracking

Node/Section Sticky Note Content Linkedin-Post-Topic "Triggers every minute for new posts in your spreadsheet" Validate-Status "Filters to process only 'Pending' items - prevents duplicates" Linedin-Post-Creator "Uses GPT-4 to generate LinkedIn content - customize prompt for your brand voice" Approval-on-Slack "Sends for human review - edit the Slack user to change approver" Webhook "Receives approval responses - ensure URL is configured in Slack app" Register Image "Initiates LinkedIn media upload - requires valid image URL from sheet" Linkedin-post "Publishes to your profile - update with your LinkedIn credentials" Post-Linkedin-Groups "Posts to multiple groups - add group IDs in Groups sheet" Update-Status "Marks as 'Posted' to prevent reprocessing"

The workflow uses a sophisticated prompt that:

Creates compelling hooks

Includes 3-4 informative paragraphs

Adds engagement questions

Inserts relevant emojis

Generates 4-6 hashtags

Formats with proper spacing

r_liteprofile - Read profile data

r_emailaddress - Access email

w_member_social - Post content

rw_organization_admin - Group posting

chat:write - Send messages

im:write - Direct messages

users:read - User information

Component Purpose Google Sheet Store post topics and status LinkedIn App API access for posting Slack App Interactive approval flow OpenAI Account GPT-4 content generation N8N Instance Workflow execution

Start with one test topic marked as Pending

Verify Slack message appears correctly

Test both "Approve" and "Edit" buttons

Check image upload completes

Confirm post appears on LinkedIn

Verify status updates to Posted

Token expiration → Refresh access token

Rate limits → Add delays between posts

Group restrictions → Check posting permissions

Missing responses → Verify webhook URL

Button not working → Check interactive components

User not found → Confirm Slack user ID

Invalid URL → Validate image accessibility

Size limits → Compress images under 10MB

Format issues → Use JPEG or PNG only

Time Savings: 80% reduction in content publishing time

Consistency: Regular posting schedule maintained

Quality Control: Human review ensures brand standards

Scalability: Handle multiple accounts and groups

Flexibility: Easy to modify and extend

File Name Purpose Linkedin Post Google Sheet to hold post topics and status

#LinkedIn

#AI

#ContentAutomation

#SocialMedia

#Slack

#GPT4

#Marketing

#WorkflowAutomation