A lot of words have been added to the dictionary over the past few decades thanks to social media, but few have become so widely used and accepted as “hashtag”

For a long time, the hashtag symbol (#) was known simply as the “pound” symbol. Now, I could swear that the only time I hear it referred to as a pound symbol is when I enter my PIN number to pay my cell phone bill.

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While hashtags were originally made famous by Twitter, they’re now used on many major social networks, including Facebook and Instagram. Let’s explore what a hashtag is, why they’re so great, and how they work on Twitter, Facebook, and Instagram.

What Does ‘Hashtag’ Mean?

A hashtag is simply a keyword phrase, spelled out without spaces, with a pound sign (#) in front of it. For example, #InboundHour and #ChocolateLovers are both hashtags.

You can put these hashtags anywhere in your social media posts: in the beginning, at the end, or anywhere in between. (Read this blog post for more instructions on using hashtags.)

These hashtags tie public conversations from all different users into a single stream, which you can find by searching for a hashtag, clicking on one, or using a third-party monitoring tool like HubSpot’s Social Inbox. Note that, in order for a post with a hashtag to appear in anyone’s search, the post must be public.

What Makes Hashtags So Great?

Back in 2007 when hashtags were a brand new concept, Google’s Chris Messina realized the value of hashtags right away. He wrote that the “channel” concept of hashtags satisfies many of the things group discussions do, but without inheriting the “unnecessary management cruft” that most group systems suffer from.

A decade later, the hashtag continues to thrive. When used properly, hashtags are a great way for individuals and brands to make their social posts more visible and increase engagement. They can give people useful context and cues for recall, aggregate posts and images together, and update a group of like-minded individuals on certain a topic in real time.

 

Hashtags are often used to unite conversations around things like …

 

Events or conferences, like #INBOUND17 or #Rio2016

Disasters or emergencies, like #Aleppo or #PrayForNice

Holidays or celebrations, like #WorldNutellaDay or #NationalCatDay

Popular culture topics, like #GameofThrones or #PokemonGO

General interest topics, like #WinterWonderland or #ChocolateLovers

Popular hashtags, like #tbt or #MotivationMonday

The key is to use hashtags sparingly and only when they add value. Use them too much, and they can be confusing, frustrating, and just plain annoying.

 

1) How Hashtags Work on Twitter

A Twitter hashtag ties the conversations of different users into one stream. If Twitter users who aren’t otherwise connected to one another talk about the same topic using a specific hashtag, their tweets will appear in the same stream.

2) How Hashtags Work on Facebook

Like on Twitter, a Facebook hashtag ties the conversations of different users into one stream. But unlike Twitter and Instagram, where many people have public accounts and their posts can be seen by anyone, most people’s Facebook posts and accounts are private. This means that even if individuals are using hashtags, they aren’t searchable. The result? The hashtags you can search for on Facebook tend to be published by influencers, brands, and publishers, rather than by individuals.

3) How Hashtags Work on Instagram

An Instagram hashtag ties the conversations of different users into one stream, just like on Twitter and Facebook. If Instagram users who aren’t otherwise connected to one another talk about the same topic using a specific hashtag, their posts will appear in the same stream.