Hashtag

A hashtag is a word or phrase written after a hash symbol, with no spaces, which the platform turns into a link. Following that link shows everything else posted with the same tag. It is a way of filing a post into a subject, and what that filing achieves has changed a great deal.

In short

• It files a post into a subject anybody can browse.
• It no longer distributes posts the way it did years ago.
• A few relevant tags beat a long list of popular ones.
• Location and branded tags are the ones still doing real work.

What it actually is

The mechanic is simple. The platform reads the symbol and the unbroken word that follows it, makes it a link, and adds the post to the collection of everything carrying that tag. Anybody can create one by using it. Nobody owns one, including the business that invented it.

Two things follow from that. There is no register and no approval, so a tag you made up may already be in use for something else. And because nobody owns it, a tag can be adopted by other people for other purposes, which is worth knowing before printing one on anything.

What changed

Hashtags were once a distribution mechanism. Feeds were closer to chronological, the tag was a real route to an audience, and adding many of them widened it.

Feeds are now assembled by systems that predict what somebody will stay for, and those predictions are built from the content of the post, from what similar people responded to, and from what that person has done before. The platforms read the images, the video and the words. A tag is one weak signal among many stronger ones, and adding more of them does not add more distribution.

What survives is narrower and still real. A tag remains a browsable collection, a search term some people use deliberately, and a way of grouping posts about a subject, a place or an event. That is a smaller job than it once was and it is not nothing.

The kinds that still earn their place

Four types are useful to distinguish, because they do different work.

• Location tags. A city, a district, a neighbourhood. These narrow an audience to people who could actually walk in or order, which is the most useful narrowing available to a local business.
• Subject tags. What the post is about, in the words somebody interested would use. These are the ones people search on purpose.
• Branded tags. Your own name or a phrase you use consistently. Worth having when customers post about you, since it gathers those posts somewhere findable.
• Event or campaign tags. Tied to something happening, with a start and an end. Useful while the thing is live and dead afterwards.

One type mostly wastes space, which is the very large general tag. A post added to a collection of many millions is buried immediately, and the people browsing there are not looking for a specific business.

What they will not do

A hashtag cannot make a post worth watching. This sounds obvious and is the single most common misunderstanding about them, because the tags are the part that feels like a lever and the content is the part that feels like luck.

A weak post with thirty tags is a weak post. The tags do not change what the platform predicts about it, they do not change whether somebody stops scrolling, and they do not change engagement rate. They change which collection the post is filed under, which matters only if somebody goes looking there.

The second thing they will not do is substitute for a plan. A business posting without a subject, a schedule or an audience does not have a hashtag problem. Tags are the last decision in organic social, not the first one, and they are frequently the only one anybody debates.

Choosing them without buying a tool

Most hashtag research amounts to three checks, and none of them needs software.

Search the tag on the platform before using it. This takes seconds and answers the two questions that matter: what is already posted there, and is it the subject you thought it was. Tags drift, and a few have been taken over entirely.

Look at how busy it is. A tag with an enormous number of posts buries a new one within moments. A tag with almost nothing in it has no audience browsing it. The useful range sits between those, and it is narrower and more specific than most accounts choose.

Keep a short reusable set. Three or four groups of tags matched to the kinds of post you actually publish, written down once, is faster than deciding each time and produces more consistent filing. Add one or two specific to the individual post on top of that.

What none of this does is settle whether the post should exist. That decision belongs to a content calendar and to knowing who you are talking to, and no amount of tag selection substitutes for it.

Words you will hear

• Branded hashtag. One a business uses consistently for its own posts.
• Banned or restricted hashtag. A tag a platform has hidden or limited, usually because of what people were posting under it.
• Tag hijack. When a tag gets adopted for a purpose the originator did not intend.
• Hashtag research. Checking what a tag already contains and how busy it is before using it.
• Alt text. Image descriptions, which the platforms read and which do more for discovery than most tags now do.

Hashtags are a filing system that used to be a delivery system. Choose a few that describe the post honestly, favour the local and the specific over the popular, and spend the attention you save on the thing the platforms are actually reading, which is the post itself and the reach it earns on its own merits.