Social media content calendar from blog posts and news feeds

Introduction

Managing a social media content calendar is one of those tasks that feels perpetually out of sync. You've got blog posts publishing on one schedule, news feeds updating constantly, and social media teams expecting fresh content ideas multiple times a week. The gap between "we have great source material" and "the calendar is actually populated" usually involves someone copying, pasting, summarising, and manually scheduling posts. It's tedious work that burns time and introduces errors.

This workflow solves that gap by connecting three tools that do one thing well each: extracting key points from long-form content, transforming those points into social media copy, and scheduling everything to your calendar in one go. No switching between tabs, no reformatting text, no manual entry. Just source material in, scheduled posts out.

The best part is that this entire pipeline runs on free or affordable tiers. You're looking at genuine automation that costs less than a coffee each month.

The Automated Workflow

How the pieces fit together

The workflow moves through four distinct stages. First, you monitor either new blog posts or RSS feeds for fresh content. Second, the content gets summarised to extract the most interesting points. Third, those summaries become social media copy tailored for different platforms. Fourth, everything lands in your content calendar automatically.

We'll build this using Zapier as the orchestration layer, though n8n and Make work equally well. Zapier is the simplest entry point for this particular workflow.

Step 1: Trigger on new content

The workflow starts with either a blog RSS feed or a news feed you want to monitor. If you're pulling from your own blog, use the RSS trigger in Zapier. If you're monitoring news, use an RSS feed aggregator like Feedly and monitor that instead.

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Trigger: Zapier RSS by Zapier
Feed URL: https://yourblog.com/feed
Check every: 15 minutes

Once a new article lands, Zapier captures the full article content. Most RSS feeds include the article body, but if yours only includes a summary, you may need to add a web scraper step to grab the full text. Zapier's "Fetch URL" action can handle this.

Step 2: Summarise with Resoomer

This is where Resoomer AI enters the workflow. Resoomer takes long-form content and produces concise summaries, which is exactly what you need before turning articles into social posts.

The Resoomer API accepts a document and returns key points. You'll need to authenticate with your API key.

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POST https://api.resoomer.com/summarize
Content-Type: application/json

{
  "doc_id": "unique_identifier",
  "api_token": "your_resoomer_api_key",
  "url": "https://yourblog.com/article-title",
  "type": "url"
}

In Zapier, add an "Webhooks by Zapier" action set to POST. Map the article URL from your RSS trigger into the request body.

The response from Resoomer comes back as structured JSON containing the summary points. Extract these and pass them forward. You're now working with distilled content instead of a 1500-word article.

Step 3: Generate social copy with Postwise

Postwise is purpose-built for social media content. It generates platform-specific copy from your summarised points. This is crucial because a LinkedIn post needs different framing, tone, and length than a Twitter post or Instagram caption.

Postwise connects via API. You'll authenticate and send your summarised content:

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POST https://api.postwise.com/generate
Authorization: Bearer your_postwise_api_token
Content-Type: application/json

{
  "content": "Key point from Resoomer summary",
  "platforms": ["twitter", "linkedin", "instagram"],
  "tone": "professional",
  "include_hashtags": true,
  "cta": "Read the full article"
}

Postwise returns formatted posts for each platform. Twitter gets a version under 280 characters. LinkedIn gets something longer and more detailed. Instagram gets a version optimised for captions with emoji and line breaks.

Step 4: Store in Mirra and schedule

Mirra is your content calendar tool. It connects to Zapier and accepts new calendar entries via API or webhook.

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POST https://api.mirra.app/calendar/entries
Authorization: Bearer your_mirra_api_token
Content-Type: application/json

{
  "title": "Blog post promotion",
  "content": {
    "twitter": "Generated Twitter post from Postwise",
    "linkedin": "Generated LinkedIn post from Postwise",
    "instagram": "Generated Instagram post from Postwise"
  },
  "scheduled_date": "2024-02-15T09:00:00Z",
  "status": "draft",
  "source_url": "https://yourblog.com/article-title"
}

At this point, the posts land in Mirra as draft entries. You set them to "draft" rather than "scheduled" to allow for a quick review before publishing. This provides a safety net against any strange transformations in the pipeline.

Complete Zapier configuration

Here's how to wire the complete workflow in Zapier:

1. Trigger: RSS by Zapier (your blog feed)
2. Action 1: Webhooks by Zapier (POST to Resoomer API)
3. Action 2: Webhooks by Zapier (POST to Postwise API)
4. Action 3: Webhooks by Zapier (POST to Mirra API)

Between each step, use Zapier's formatter to clean and reshape the data. The formatter converts Resoomer's response format into what Postwise expects, and Postwise's output into what Mirra expects.

The full trigger configuration in Zapier looks like this:

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Trigger Setup:
- App: RSS by Zapier
- Feed: Your blog RSS URL
- Check every: 15 minutes
- Include: Full article content

Step 1 (Resoomer):
- App: Webhooks by Zapier
- Method: POST
- URL: https://api.resoomer.com/summarize
- Headers: Content-Type: application/json
- Data:
  - api_token: [Your Resoomer API key]
  - url: [Article URL from RSS feed]
  - type: "url"

Step 2 (Resoomer Response Parser):
- App: Formatter by Zapier
- Transform: Parse JSON
- Input: [Resoomer API response]
- Extract: summary_points field

Step 3 (Postwise):
- App: Webhooks by Zapier
- Method: POST
- URL: https://api.postwise.com/generate
- Headers: Authorization: Bearer [Your Postwise API key]
- Data:
  - content: [Summary from Step 2]
  - platforms: ["twitter", "linkedin", "instagram"]
  - tone: "professional"
  - include_hashtags: true

Step 4 (Schedule Decision):
- App: Formatter by Zapier
- Calculate: Add 3 days to trigger date
- Purpose: Schedule posts for 3 days after article publication

Step 5 (Mirra Calendar):
- App: Webhooks by Zapier
- Method: POST
- URL: https://api.mirra.app/calendar/entries
- Headers: Authorization: Bearer [Your Mirra API key]
- Data:
  - title: [Article title from RSS]
  - content: [Generated posts from Postwise]
  - scheduled_date: [Calculated date from Step 4]
  - status: "draft"
  - source_url: [Article URL]

When you run this for the first time, start with a single test article. Inspect each step's output in Zapier's history to ensure data is flowing correctly. You'll often need to adjust field mappings when an API returns data in an unexpected format.

Error handling and retries

APIs can fail temporarily. Zapier automatically retries failed tasks, but you should configure sensible retry rules. Set Zapier to retry up to 3 times with exponential backoff. If Resoomer fails to summarise a particularly long article, that's valuable information; you might need to truncate articles over a certain word count before sending them to Resoomer.

For failed calendar entries, Zapier can send you a notification email with the error details. This lets you spot patterns; for example, if Mirra starts rejecting entries, you'll know immediately rather than discovering it a week later when your calendar hasn't updated.

Add a final step that logs successful runs to a Google Sheet. This creates an audit trail and helps you spot which content types produce the best calendar entries.

The Manual Alternative

If you want more control over the final output, you can run the first three steps automatically and let the calendar step stay manual. This means Postwise generates the social copy, but you review it in Mirra before it's marked as scheduled.

Alternatively, you can break the workflow into smaller pieces. Run Resoomer and Postwise on a schedule, have the output land in a Slack channel, and then someone from your team copies the posts into Mirra directly. This trades automation for flexibility; your team sees the generated content in a familiar tool and can edit it before publishing.

The middle ground is often the right place for teams just starting with automation. Once the workflow has run for a few weeks and you're confident in the output quality, you can move to full automation.

Pro Tips

Monitor summarisation quality

Resoomer's output quality depends on article structure. Well-formatted blog posts with clear headings produce better summaries than rambling text. If you notice poor summaries, check whether the original articles follow a logical structure. You might need to nudge your blog writing team toward clearer formatting.

Add platform-specific posting times

Mirra allows you to schedule posts for different times on different platforms. Twitter performs better in the morning, LinkedIn in mid-morning, Instagram in evening. Rather than scheduling all three versions for the same time, adjust the Zapier workflow to stagger them. This small change often improves engagement significantly.

Handle RSS feed duplicates

Some RSS feeds republish old content periodically, or you might accidentally monitor the same feed twice. Zapier's "Only continue if" condition can filter duplicates based on URL. Add a condition: "only create calendar entry if URL hasn't appeared in Mirra in the past 7 days." This prevents the workflow from creating duplicate calendar entries.

Rate limit awareness

Both Resoomer and Postwise have rate limits on their free plans. Resoomer's free tier allows 10 requests per day. If you're monitoring multiple feeds, you'll exceed this quickly. Either upgrade to a paid plan or split your feeds across separate Zapier workflows scheduled at different times. This prevents all requests from firing simultaneously and hitting the limit.

Cost optimisation with news feeds

If you're pulling from external news feeds, not all articles are relevant. Add a text matching filter in Zapier before calling Resoomer. For example, if you only care about news mentioning your company name or specific keywords, filter for those terms. This reduces API calls and saves money while ensuring your calendar stays focused.

Cost Breakdown

Cost-saving options

If budget is tight, use Make instead of Zapier. Make's free plan is more generous (1,000 operations per month versus Zapier's 100 tasks). Operation count isn't directly comparable to Zapier tasks, but Make typically goes further. Alternatively, run this workflow with n8n self-hosted; you pay for server costs but no per-operation fees.

For summarisation, if you already have a ChatGPT Plus subscription, use Claude Code or ChatGPT directly instead of Resoomer. You lose the integration convenience, but the cost is zero additional expense.

Scaling costs

If you monitor five separate blogs and news feeds, costs scale linearly. You'd need five separate Resoomer API calls per day, pushing you over the free tier quickly. At that scale, moving to Pro tier Resoomer (£9.99/month) and Zapier Starter (£24.99/month) keeps your total around £65 monthly while handling significantly more volume.

Getting started today

The beauty of this workflow is you can start with a single blog feed and one social media platform, then expand. Test it first with Twitter only, since Twitter posts are smallest and easiest to verify. Once you're confident in the output, add LinkedIn and Instagram. This staged approach lets you spot problems early without overwhelming yourself with too many moving parts at once.