How to Auto-Generate Social Media Captions From New Blog Posts

Every time you publish a blog post, you probably want a few social captions to go with it. This Zap watches your site's RSS feed, sends each new post to an AI step that writes captions tuned per platform, and drops the drafts where you can review or schedule them.

What you need

• A Zapier account
• A public RSS feed for your blog (most platforms have /feed or /rss)
• A destination such as a Google Doc, Buffer, or a Slack channel
• About 10 minutes

Step 1: Trigger on a new RSS item

Add the RSS by Zapier trigger New Item in Feed. Paste your feed URL and test. Zapier loads the latest post so you can see fields like Title, Link, and Description.

Step 2: Draft captions with AI

Add an AI action and map the post Title and Description into the prompt. Ask for several captions at once, each labeled by platform, so one run produces everything you need.

Write 3 social captions for this blog post.
Match each platform's tone and length:

X (under 240 chars, punchy, 1 emoji):
LinkedIn (3 short lines, professional):
Instagram (friendly, 3 relevant hashtags):

Title: {{Title}}
Summary: {{Description}}
Link: {{Link}}

Step 3: Send drafts somewhere reviewable

Add a final action that delivers the drafts. A Slack message or a new Google Doc works well for a human review step. If you trust the output, connect Buffer or a publishing app to queue posts directly.

Result: You publish a post and, minutes later, three ready-to-edit captions tuned for X, LinkedIn, and Instagram are waiting for a quick review or auto-queued.