How-to guide
To post a newsletter to social media automatically, give a tool your newsletter’s RSS feed. Substack, Ghost and Buttondown have one already; on beehiiv you create it in Settings, RSS; Kit has none. Check that the feed carries the whole edition, then choose what the tool should do with each new edition: post a link, show it to you so you write the posts, or write and publish the posts for you. Only the last one saves the writing. I build Quibr, which is that last kind.
Disclosure: I am Vicente Évora, the founder of Quibr, an agent that writes and publishes posts from a newsletter’s feed. The feed facts come from my own study of 119 newsletters and from each platform’s help pages, read on 27 October 2026.
Through its RSS feed. The feed lists your newest editions. A tool reads it every so often, notices a new edition, and does something with it on X, LinkedIn, Threads or Facebook.
What “something” means is the real choice. A one-line post with a link is easy to automate and easy to scroll past. Posts that each carry an idea from the edition are what bring readers, and those take writing. Automation is one part of the full guide to promoting a newsletter on social media.
| Platform | Feed address | Anything to switch on? |
|---|---|---|
| Substack | yourname.substack.com/feed, or your domain plus /feed | No |
| Ghost | Your site plus /rss/ | No, unless the site is private |
| Buttondown | buttondown.com/yourname/rss | Web archives must be on |
| beehiiv | A generated address ending in .xml | Yes: Settings, then RSS, then New RSS Feed |
| Kit | None | Kit’s RSS feature brings a blog into Kit, not a newsletter out |
“A unique RSS Feed URL will be generated for your publication. Copy and use this URL as needed.”
On beehiiv, deleting a feed and creating a new one changes its address, so update any tool that uses it.
Open the feed address in your browser and search it for a sentence from the end of your newest edition. If it is there, the feed carries the whole edition.
Many feeds do not. In my study of 119 newsletter feeds, all 20 beehiiv feeds, 19 of 20 Buttondown feeds and 18 of 19 Ghost feeds carried full editions, but only 10 of 20 Substack feeds did, because paid posts are cut off with “Read more” and short notes sit between editions. A tool that writes from a short feed writes from a paragraph.
Quibr handles this: when an edition in the feed is under 150 words, it opens the edition’s page and writes from the full text, as long as the page carries that edition’s title or opening.
| Kind | What it posts | Who writes | Good for |
|---|---|---|---|
| A link poster | Each new edition’s title and link | Nobody | Telling existing followers a new edition is out |
| A scheduler with feeds, such as Buffer | What you write from the edition it shows you | You | Writers who enjoy writing their own posts |
| An agent, such as Quibr | Several posts per edition, each with one idea | The agent, in your voice | Writers who want the posts without writing them |
A link alone brings few new readers. On X it also reaches fewer people, because X limits posts with outside links, as I explain in where to put your newsletter link. For the full comparison of tools, read the tools that turn a newsletter into social posts.
The free plan includes one full agent run on your latest edition, so you see real posts before you pay.
From the table above. On beehiiv, create the feed first.
X, LinkedIn, Threads and Facebook Pages, whichever you use.
Quibr writes against posts you have already published, so the new ones sound like you.
Manual: you approve every post. Light Touch: posts go out unless you step in during a window of 1 to 24 hours. Full Auto: posts go out on their own. An emergency stop halts everything at once.
Setup takes about ten minutes. Quibr checks your feed every 30 minutes, writes the posts as soon as a new edition appears, and spreads them over the following days. It costs $29 a month after a seven-day free trial.
Kit publishes no RSS feed that I could find, and none of the 20 Kit newsletters in my study had one. Kit’s RSS feature goes the other way: it turns a blog’s feed into broadcasts. So no tool can pick up a Kit edition from a feed. If you also publish your editions on a site that has a feed, connect that feed instead.
Substack gives every publication an RSS feed at /feed. A tool that reads it can post each new edition, or write posts from it, on X and LinkedIn. Paid posts appear in the feed cut off.
In beehiiv, open Settings, choose your publication, click RSS, then New RSS Feed. beehiiv generates a unique address ending in .xml. Its help says this is on all plans.
Not that I could find. Kit’s RSS feature brings a blog’s feed into Kit, and none of the 20 Kit newsletters in my study had a feed.
Yes, with a tool that reads your feed and posts to LinkedIn. A link poster shares each edition’s link. Quibr writes LinkedIn posts from each edition and publishes them.
A link poster writes nothing. An agent writes from your edition, and the good ones write against your own past posts. Read the first posts and keep approval on until they sound like you.
A link poster can be free. Buffer starts free for 3 channels, but you write the posts. Quibr is $29 a month and writes the posts, after a seven-day free trial.
Founder of Quibr
Vicente writes Notes to 10K MRR, a weekly build-in-public newsletter on beehiiv, alongside university and a part-time job. Every edition went out on time, and the social posts that were supposed to follow it never did.
He built Quibr to write those posts for him. It started as an idea on 26 November 2024, and the first version shipped in January 2025. Quibr is built and run by one person, and Vicente answers support email himself.
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