Mastodon, Bluesky and Threads: Auto-Posting Your Blog With PostRSS

Mastodon, Bluesky and Threads have grown into a real alternative audience for publishers, agencies and businesses that share articles. Each works differently: Mastodon is a federation of independent servers, Bluesky runs on the open AT Protocol, and Threads is Meta’s text network tied to Instagram accounts. What they have in common is that they reward regular, useful posts with links, which is exactly what a blog produces. Posting every new article by hand to all three, however, quickly becomes a chore that gets skipped.

This guide explains how the three networks differ for link sharing, what to prepare on your website before automating anything, and how to set up automatic posting from your RSS feed with PostRSS, the RSS auto-posting service built by our team. It also covers the formatting details, such as character limits and preview cards, that decide whether automated posts look native or neglected.

Why These Three Networks Are Worth Your Feed

For years, link sharing was concentrated on a few large platforms whose algorithms increasingly favoured content that keeps people on the platform. Mastodon, Bluesky and Threads give publishers more room:

• Mastodon shows posts chronologically to followers and lets anyone follow your account across thousands of servers. There is no ranking algorithm that hides links.
• Bluesky combines a following feed with custom feeds that users choose, so a well-tagged post can reach people interested in a topic, not only your followers.
• Threads starts with a large potential audience, because accounts are linked to Instagram identities and existing followers can follow you with a tap.

None of them is likely to replace your main channels overnight. But each adds a steady stream of readers at almost no extra cost once posting is automated, and early, consistent presence tends to compound as the networks grow.

How the Networks Differ for Link Posts

Before automating, it helps to understand the practical differences. They affect how you connect each account and how your posts appear.

Plan details change over time, so check the current PostRSS pricing page before deciding. The network setup pages on postrss.com describe each connection step in detail.

Prepare Your Website First

Automation can only post what your website provides. Three things matter most.

A clean RSS or Atom feed

Most content management systems publish a feed automatically, for example /feed/ on WordPress. Open it in a browser and check that new articles appear with the correct title, link and a short description. If you only want certain categories to be shared, use a category feed or the keyword filters in PostRSS.

Open Graph tags on every article

All three networks build link previews from your page’s Open Graph tags: og:title, og:description and, most importantly, og:image. The Open Graph protocol documents these tags. Without them, a post shows a bare link that few people click. Use a large, sharp featured image for every article, and make sure it does not rely on small text that becomes unreadable in a preview card.

Titles that work without context

On Bluesky in particular, the post text is short. A title like “Part 3” or “Update” tells a reader nothing. Write titles that stand on their own and say what the article delivers, which is good practice for search engines too.

Setting Up Mastodon

Mastodon has no central company that approves applications, so connecting is self-serve. In your Mastodon account, open the Development section of the preferences, create a new application and copy the access token it gives you. The official Mastodon documentation explains applications and permissions if you want the technical background.

PostRSS posts to the server where your account actually lives, whether that is a large general server, a niche community server or one you run yourself. Mastodon-compatible servers also work, including GoToSocial, Friendica, Akkoma and Pleroma, among others listed on the PostRSS Mastodon page.

Two Mastodon-specific tips:

• Use hashtags. Many Mastodon users follow hashtags rather than accounts. PostRSS can turn the categories and tags of each feed item into hashtags, up to a limit you set.
• Respect the server rules. Some servers ask that automated accounts are marked as bots in the profile settings. Check your server’s rules and set the flag if required.

Setting Up Bluesky

Bluesky uses app passwords: separate passwords that you generate in your account settings for each application, and can revoke at any time without changing your main password. Generate one, give it a recognisable name such as “PostRSS”, and paste it together with your handle into the PostRSS target settings. There is no business account requirement or app review.

Because Bluesky is built on the open AT Protocol, accounts can live on other servers too. PostRSS also works with Bluesky accounts hosted on other AT Protocol servers or on your own self-hosted personal data server.

The 300-character limit is the main formatting constraint. PostRSS trims long titles cleanly so that the link always survives instead of being cut off mid-address. Choose a message format with the title only, or title plus a short static text, rather than the full description.

Setting Up Threads

Threads accounts are tied to Instagram identities, so the account you connect is the one your Instagram followers already know. Connect it in PostRSS through Meta’s authorisation, choose the feed and the message format, and new articles are posted as text posts with a clickable link.

Behind the scenes, Threads publishing uses a two-step model: a post container is created first, then published. PostRSS handles both steps for you. Posts can be up to 500 characters, which leaves room for a title, a sentence of description and the link.

Threads is the most algorithm-driven of the three. Consistent posting matters, and so does an occasional manual reply or comment on your own posts, because engagement signals affect how widely posts are shown.

Formatting Posts That Look Native

The difference between automated posts that people click and those they ignore is mostly formatting. PostRSS offers nine message formats built from the item title, the item description, the page title or your own static text. A few guidelines for these networks:

• Bluesky: title and link only, or title with a short static prefix such as “New on our blog:”. Keep it well under 300 characters.
• Mastodon: title, a one-sentence description and two or three relevant hashtags. Avoid long hashtag lists; they look spammy.
• Threads: title plus the first sentence of the description reads naturally and uses the 500 characters well.
• All three: check that the preview card shows the correct image. If it does not, fix the Open Graph tags on your website rather than the post.

Add UTM parameters to every link so your analytics can tell which network sends real visitors. PostRSS can append your own parameters, such as utm_source=bluesky, automatically; our guide to UTM parameters for auto-posted traffic shows a naming scheme that keeps reports clean.

Timing, Volume and Filters

PostRSS checks each feed as often as every minute, so a new article typically reaches all three networks within minutes of going live. That speed is useful for news and announcements, but not every site wants posts at any hour. On paid plans you can limit posting to chosen hours or exact times in your time zone.

Volume matters too. A site that publishes twenty items a day should not push all of them to every network. Use keyword filters to include or exclude items by words in the title and description, set a maximum number of posts per update, or connect a category feed instead of the full feed. On Mastodon especially, an account that floods timelines is quickly muted.

If you are starting with an archive of good older articles, PostRSS can also catch up older items from a date you choose. Spread them out with a modest posts-per-update setting, so new followers discover your best work without a burst of posts on day one.

Measuring Results

Give each network a few weeks before judging it. Then compare, in your analytics, sessions and engaged sessions by utm_source. Useful questions:

• Which network brings visitors who read more than one page?
• Which topics perform best on each network?
• Do posts at certain hours perform better?
• Does any network bring newsletter sign-ups, enquiries or sales?

Use the answers to adjust message formats, posting windows and filters per network. Because each target in PostRSS has its own settings, you can tune Mastodon, Bluesky and Threads separately while they all draw from the same feed. If you also distribute content by email, compare these channels with your e-marketing results to see where readers engage most.

Common Mistakes to Avoid

Most problems with automated posting on these networks are easy to prevent once you know them:

• Posting the same text everywhere. A format that suits Threads may be too long for Bluesky. Give each target its own message format instead of copying one setting across all three.
• Ignoring replies. Automation publishes, but it does not converse. Check notifications a few times a week and answer questions; on all three networks, an account that never replies looks abandoned.
• Broken preview images. Images blocked by hotlink protection, served only to logged-in users or too small for a card leave posts without a picture. Test a new article’s URL in each network’s composer before relying on automation.
• Using your main password. On Bluesky, always connect with an app password, never with the account password. If you stop using a tool, revoke its app password or Mastodon application token.
• Flooding new followers. Catching up an archive of hundreds of items at once can push followers to mute you. Spread older items over days or weeks.
• Forgetting the profile. A complete profile with a clear name, avatar, description and link to your website turns a click on a post into a follow. It takes ten minutes and pays off for years.

Frequently Asked Questions

Can PostRSS post to Mastodon, Bluesky and Threads from one feed?

Yes. Add the feed once and connect it to a separate target for each network. Each target has its own message format, filters and schedule.

Do I need a developer account for Mastodon or Bluesky?

No. For Mastodon you create an application in your own account preferences and copy the token; for Bluesky you generate an app password in your settings.

Which PostRSS plan includes Threads?

According to the current pricing page, Threads is included from the Professional plan, while Mastodon and Bluesky are available from the Free plan.

Why does my post show no image?

The networks build preview cards from your page’s Open Graph tags. Check that each article has a valid og:image and that the image URL loads publicly.

Will long titles be cut off on Bluesky?

PostRSS trims long titles cleanly to fit Bluesky’s 300-character limit, so the link is always kept intact.

Does PostRSS work with self-hosted Mastodon servers?

Yes. It posts to whichever server your account lives on, including self-hosted servers and Mastodon-compatible software such as GoToSocial or Akkoma.

The Bottom Line

Mastodon, Bluesky and Threads reward exactly what a blog produces: regular posts with useful links. Prepare your feed and Open Graph tags, connect each network with the method it expects, choose short native-looking formats, add UTM parameters and filter the volume. Once that is set up, every new article reaches three growing audiences within minutes, without anyone copying links by hand. You can start with Mastodon and Bluesky on the PostRSS Free plan and add Threads when you upgrade. If you would like help planning content distribution across networks, contact our team.