Automatically Create Social Media Posts from Blog Content

Automatically Create Social Media Posts from Blog Content

Ever wish your new blog posts could magically become engaging social media content—without you having to copy, paste, reword, and schedule it all yourself? Good news: with the right tools and a pinch of automation, you can set up a workflow that reads your blog posts, generates catchy social captions, and queues them up on your favorite networks…all while you focus on your next big idea.

Why Automate This?

Let’s be honest—repurposing content is just smart. Your blog has valuable stories, tips, or updates, but not everyone scrolls your website. Social media is where your audience hangs out. The problem? Manually chopping up your posts, coming up with captions, juggling scheduling tools… it gets old fast.

With automation, you:

  • Save hours every week (that add up fast for small teams)
  • Show up consistently where your audience is, not just when you remember
  • Keep your messaging fresh (AI is great at putting things in new words!)
  • Make your content work harder—get seen and shared more

Step-by-Step Setup

Let’s break down how you can connect your blog to your social feeds with four friendly tools: n8n (your automation hub), OpenAI (smart text generation), Buffer (social media scheduler), and Google Docs (content storage or review if you want). Don’t worry—no code required. Just tinkering and clicking.

Step 1: Detect New Blog Posts (Trigger)

First, you want your workflow to wake up whenever you publish a new blog post. Most blogs support an RSS feed—that’s like a news ticker for updates.

In n8n, use the RSS Feed Trigger node. You point it at your blog’s RSS URL. When there’s a new article, it kicks off your automation!

What This Looks Like: Imagine a flowchart where the blog sits at the top, and every new post is a raindrop that starts a series of actions below.

{
  "blogTitle": "How to Grow Your Email List",
  "blogLink": "https://example.com/blog/email-growth",
  "content": "In this post, we’ll cover easy ways to get more email subscribers..."
}

Tips: If you use WordPress or Medium, they’ve got RSS built in (just add /feed). For Substack and others, look for their RSS link in your account area.

Step 2: Pull Blog Content and Prep It

With the trigger fired, you want to grab the title, link, and plain text of the post—not just a summary. Use n8n’s HTTP Request or HTML Extract node to scrape the full article (or fetch it via API if supported).

Workflow Visual: After the RSS trigger, the flow grabs the post details and hands them off to the next step.

{
  "title": "How to Grow Your Email List",
  "url": "https://example.com/blog/email-growth",
  "bodyText": "To really grow your list, start by..."
}

Tips: If you want to filter by tags or exclude certain types of posts, add a condition here (n8n’s IF node helps).

Step 3: Generate Social Captions with OpenAI

Here’s where the magic happens! Pass your blog content to the OpenAI node in n8n. Give it a prompt like: 

"Write 3 catchy social media captions that summarize this article in plain English and add a call to action."

You can tweak the number or style as you like. OpenAI will reply with a list of captions—often unique, easy to read, and social-ready.

Workflow Visual: The blog’s summary gets routed through an AI “caption generator” box before moving on.

{
  "captions": [
    "Ready to boost your email list? Check out our latest tips! 👇",
    "Wish your newsletter reached more people? Don’t miss these growth hacks.",
    "Grow your audience fast—discover our simple subscriber strategies!"
  ]
}

Tips: Change the tone, platform, or length in your prompt if you want captions for Twitter (short and punchy) vs Facebook or LinkedIn (a bit longer).

Step 4: Store or Review in Google Docs (Optional)

Not sure you want 100% automatic posting? Send the generated captions to a Google Doc for editing, team review, or archiving.

n8n’s Google Docs node lets you create or update documents. You might have a file for each blog or a spreadsheet with columns for date, post, and status.

Workflow Visual: After captions are made, a branch sends them to Google Docs before the next step.

{
  "docTitle": "Social Captions for: How to Grow Your Email List",
  "captions": [
    "Catchy tip A…",
    "Catchy tip B…"
  ]
}

Tips: Sharing your Google Doc with a teammate? Set up notifications so they know when new captions await review.

Step 5: Schedule Posts to Buffer

Here’s the finish line. Send each caption (and a blog link or image, if you want) to Buffer using its API. Buffer automates cross-posting and scheduling across platforms like Twitter, Facebook, LinkedIn, and Instagram.

Currently, Buffer’s public API is restricted. BUT you can use n8n’s Webhook node to hand off data to Zapier (which connects with Buffer for scheduling). Your workflow: n8n → Zapier webhook → Buffer.

Workflow Visual: Each polished caption travels through a final step (Webhook) and lands in Buffer’s queue, ready for publishing.

{
  "text": "Grow your audience fast—discover our simple subscriber strategies!",
  "link": "https://example.com/blog/email-growth",
  "profile_ids": ["facebook_profile_id", "twitter_profile_id"]
}

Tips: With Zapier, you can customize timing (queue posts for mornings, after lunch, etc.), or even pick which Buffer profiles get which captions.

Real Example: Small Business Social Repurposing

Suppose you’re running a marketing agency. You post a new article on your blog every Friday. You want those insights to show up on Facebook and LinkedIn, plus a punchy Tweet or Insta post.

  1. Your workflow spots the fresh post via RSS on Friday afternoon.
  2. It grabs the article and asks OpenAI to whip up 4 short summaries with CTAs.
  3. Each summary, plus a tracking link, gets sent to Buffer via Zapier—spaced out through the weekend and Monday.
  4. Meanwhile, a Google Doc tracks what’s been posted and when. If you want to tweak a caption later, it’s easy to find.

With this setup, your Friday writing becomes a week of social content—without extra copy-paste. You get to focus on clients, not fiddling with schedulers or captions.

Tools You’ll Need

  • n8n (automation workflow builder; free and open source)
  • OpenAI (for generating natural-sounding captions)
  • Google Docs (optional; for editing or logging captions)
  • Buffer (for scheduling and cross-posting)
  • Zapier (as a bridge between n8n and Buffer, if needed)
  • RSS feed URL (from your blog)

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Final Thoughts

Setting up automatic social media captions from your blog isn’t just for big companies or coding whizzes. With tools like n8n, OpenAI, Buffer, and Google Docs—plus a little Zapier magic—you can put your content distribution on autopilot, grow your reach, and finally stop dreading that blank “what do I post today?” box.

Try tweaking your workflow as you go: add hashtags, generate visuals, or post in different languages. Automation is all about freeing up your creativity for the big stuff. 🎉

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