Hashtag-Driven Discovery

Lesson 1: Hashtags Are the Algorithm

On Mastodon, you can follow hashtags the same way you follow accounts. This changes everything.

What hashtag follows enable

When someone follows a hashtag (e.g., #indiehackers), every post with that hashtag appears in their Home timeline alongside the people they follow.

That means your post with #indiehackers reaches:

1. Everyone who follows you.
2. Everyone who follows the hashtag.

The second group can be much larger than the first, especially when you're new.

Why this is the closest thing to an algorithm

Mastodon doesn't push your posts to strangers via a recommendation engine. But hashtags route your posts to interested strangers via opt-in subscription.

It's distribution-by-tagging. Tags work as the routing layer.

What this changes about strategy

1. Hashtags become essential, not optional.
2. Niche-specific tags outperform broad ones. Same as Bluesky.
3. Consistent tagging compounds. Show up reliably under a tag and you become recognizable to followers of that tag.
4. You can run your own hashtag. Your brand or campaign as a hashtag, encouraged for reuse.

How many hashtags?

Mastodon norms:

• 2-4 hashtags per post is the sweet spot.
• 0 hashtags misses the discovery layer.
• 5+ hashtags reads as spammy by Mastodon norms.

This is more than X (where 1-2 is the norm) and less than Instagram (where 5 is the norm).

Lesson 2: Picking the Right Hashtags

The same rule that applies elsewhere applies here: niche, not broad.

High-fit, medium-volume

Find tags where:

• The topic matches what you post about exactly.
• The tag has a steady stream of posts (not dead).
• The tag isn't so saturated that yours gets buried.

For most niches, the right tags have hundreds to thousands of posts per week — not millions, not single digits.

Examples

For an indie SaaS founder:

High-fit, medium-volume (use these):

• #indiehackers
• #buildinpublic
• #saas
• #microsaas
• #solopreneur

Low-fit, high-volume (avoid):

• #startup (too broad)
• #business
• #entrepreneur

High-fit, low-volume (sparingly):

• Niche-specific tags for sub-communities — useful when active, but limited reach.

How to research

1. Search the tag. Look at the volume of recent posts. Active or dead?
2. Look at who's posting under it. Are they accounts like yours? Or unrelated?
3. Check the local instance's trending tags. Some instances surface trending hashtags.
4. See what's in your niche peers' bios. They've often researched the right tags already.

CamelCase your hashtags

The Mastodon convention is to capitalize each word in a multi-word hashtag for accessibility (screen readers parse them better).

• Right: #IndieHackers, #BuildInPublic, #OpenSource.
• Wrong: #indiehackers, #buildinpublic.

Stick to CamelCase. The audience notices.

Lesson 3: Hashtag Etiquette

Mastodon culture has specific norms around hashtag use. Get them right.

Don't hashtag-stuff

Posts with 8+ hashtags read as spammy. The audience and many instance moderators take a dim view.

Limit to 4. Curate which 4.

Don't hijack hashtags

Tagging your unrelated promotion with a popular hashtag for visibility is a classic spam move and gets you reported quickly on Mastodon.

If your post doesn't fit a tag, don't use it.

Use brand hashtags

A unique tag for your brand or product (e.g., #bolta) is fine. Don't expect it to drive significant traffic, but it aggregates content over time.

Hashtag-only posts are fine

Some accounts post just to share a useful hashtag they discovered. The post is short — "If you're new here, check out #NewToMastodon for intros." This kind of public-service post is appreciated.

Hashtag comments

If you want to add hashtags after the post body, line-break and place them at the end. Don't intersperse them throughout the post — that's an X convention that reads weird on Mastodon.

Here's a thought about indie SaaS pricing — 
[the body]

#IndieHackers #BuildInPublic #SaaS

Common myths

1. "Hashtags are spammy." They're not, used right. Mastodon's design assumes you'll use them.
2. "More hashtags = more reach." Past 4, returns plummet and reputation drops.
3. "I shouldn't use hashtags if I have followers already." You should — followers + hashtags is how you find new audiences.

Action Steps

1. Build a curated list of 8-12 hashtags for your niche. Camel-case them.
2. Use 2-4 per post. Vary which ones across posts (don't copy-paste the same set every time).
3. Try following 3-5 hashtags yourself. See what comes through your home feed. Tells you what those tags actually deliver.

Hashtags are how Mastodon distribution works. Use them like the routing infrastructure they are. Next lesson: cross-instance networking.