Twitter has become a mainstay in our lives ever since Jack Dorsey posted the first-ever tweet in March 2006. And with the platform’s significant growth, it has naturally become a launchpad for many big global issues and movements.Often featuring prominently in these charges are Twitter hashtags. And while it may seem a little shocking that a blue link on the internet can shape history, here are 10 that did precisely that. Before we start, it’s worth noting that these are in no particular order.

1. #BarCamp

#BarCamp was one of the most influential hashtags—not because of what it stood for, but because of what it created.

Why? The answer’s simple—it was the first-ever hashtag on Twitter.

In August 2007, Chris Messina sent the following post:

Messina’s intention was to allow conversations about BarCamp, an ad hoc unconference for like-minded people to meet with each other. Long story short: it wasn’t such a bad idea.

2. #MeToo

The Me Too movement was actually founded in 2006 by activist Tarana Burke, but the hashtag took off on Twitter in 2017. In that year, Alyssa Milano posted this viral tweet which helped spread the phrase:

Milano’s tweet followed a New York Times story about Harvey Weinstein. In this, the newspaper revealed sexual harassment allegations spanning decades.

The movement aimed to raise awareness of women who had been either harassed or assaulted. After Milano’s tweet, the hashtag was used 19 million times in the space of 12 months. Other languages have different variations of the tag, including French and Arabic.

Since Milano’s tweet, companies such as Google and Airbnb have changed legislation that sexual harassment claims no longer require arbitration.

3. #Flygskam

Twitter has played a significant role in raising awareness about climate change. But beyond that alone, the platform has also prompted action from ordinary users.

One important hashtag is #flygskam, which originated in Sweden. Translated into English, it means “flight shame”. The concept is simple: travel using methods that emit less CO2 than aircraft, such as going by train.

Flygskam’s origins can be traced back to 2017. In that year, the Swedish singer Stefan Lindberg said he would stop flying.

In 2019, the country saw a 9% decline in domestic air travel. That same year, overall passenger traffic also decreased through its 10 airports—just over 40 million, compared to 42 million in 2018.

Since the term was coined, Klarna—a fintech company headquartered in Stockholm—has banned almost all short-haul flights for business. Similarly, long-haul journeys by plane are also discouraged.

The term has since spread to other countries—“flugscham” is the German equivalent.

4. #OscarsSoWhite

This hashtag has been dubbed the "hashtag that changed the Oscars" by The New York Times. While the hashtag existed before the 2016 Oscars, the lead up to the event saw it go viral.

The hashtag's rise to viral status resulted from the announcement of nominations in the best lead and supporting actor categories. For the second year in a row, no people of color were nominated in these categories.

High-profile actors and directors announced that they would boycott the event, while others spoke out about the need for more diversity. According to USA Today, the Academy's governing board voted to double female and minority membership by 2020 a week after the announcement of nominations.

5. #BlackLivesMatter

Over the last decade, conversations about racial inequality have grown louder. This is especially the case in the US, where it remains a significant issue across the country.

One of the most commonly-used hashtags when discussing the issue is #BlackLivesMatter or its abbreviated term #BLM. The hashtag first appeared on the platform in 2013.

The hashtag has become a mainstay in many users’ bios and also resurfaced on numerous occasions. These include the 2014 unrest in Missouri and the death of Eric Garner in the same year.

#BlackLivesMatter then gained further prominence in May 2020, following the death of George Floyd in Minneapolis police custody. The hashtag was tweeted millions of times in the following days, while protests also took place worldwide.

Beyond raising awareness of racial inequality, the movement has prompted millions of dollars in donations.

There has, however, also been criticism of the movement. For example, Newark Mayor Ras Baraka argued that the movement’s calls to defund the police as a “bourgeois liberal” solution to America’s deep-lying racial issues.

6. #DeleteFacebook

Facebook has received negative press on more than one occasion. Some of the largest backlashes it has received relate to the #DeleteFacebook hashtag, which rose to prominence in 2018.

In that year, users became increasingly fed up with the platform and its scandals. Besides Cambridge Analytica, which saw data from millions of account holders misused, the company was also criticized for its potential role in the 2016 election.

Jim Carrey was one big name to tweet his discontent for the platform. Brian Acton, the former head of WhatsApp (now owned by Facebook), also shared his thoughts.

Since #DeleteFacebook was first used, more users have grown skeptical of social media platforms’ practices.

Beyond the use of their data, the hashtag has also helped shed light on these companies’ ethics elsewhere. One example is how social media platforms develop deliberately addictive apps to clock up as much screen time as possible. It led to more conversations about the ways that Facebook invades your privacy.

7. #FakeNews

Since 2016, fake news has become a mainstay word in many people’s lives. In that year, the hashtag rose on Twitter in the build-up to the US presidential election. It was used frequently by Donald Trump during his campaign.

Once Trump took power, he continued using the term. However, it has been thrown around by both ends of the political spectrum.

The fake news hashtag was significant for numerous reasons. It got many people to question the content they consume online and shed light on the importance of checking facts before making judgments. Some users chose to fight back against fake news on social media in the face of rising misinformation.

For media outlets, the hashtag has also stressed the significance of ensuring that all stories are factually correct before publishing.

8. #NeverAgain

Throughout the 21st century, the US has been the scene of numerous high-profile mass shootings. After each of them, debates surrounding gun control have surfaced and grown louder.

Some of the biggest backlashes came in 2018, following the Marjory Stoneman Douglas High School shooting in Florida. After the tragedy, the hashtag #NeverAgain surfaced on both Twitter and Facebook.

In the days that followed, rallies took place throughout the US. Some of the survivors used Twitter as a platform to elevate their thoughts and attempt to drive a conversation around gun control and other issues.

9. #OccupyWallStreet

Economic inequality is a big talking point around the world. In 2011, Twitter was used to elevate protests related to this with the hashtag #OccupyWallStreet.

That year, protesters started off by setting up a base camp in Lower Manhattan, New York. Soon after, the movement spread to other parts of the country.

The hashtag was designed to highlight how what protestors believed to be the wealthiest 1% of the country’s population continued to benefit from power, greed, and corruption. Meanwhile, the remaining 99% were—in its eyes—falling further behind.

#OccupyWallStreet was vital because it started conversations around economic inequality and what could be done to help those at the lower end of the income scale.

10. #FridaysforFuture

Greta Thunberg was one of the most significant Twitter stars of the late 2010s. In 2018, the Swede sat outside her country’s parliament in Stockholm every school day for three weeks in the lead-up to the country’s election.

As the movement grew, #FridaysforFuture was created. The hashtag aimed to encourage other school children worldwide to strike, which is what happened.

Since then, climate protests have grown in both frequency and prominence around the world.

As a result of the movement, the conversation around climate change and what can be done has grown larger. Beyond politicians considering their options, numerous companies have also made carbon-neutral pledges.

For years, Thunberg has continued to tweet using the hashtag.

Hashtags Can Hold Great Power

Hashtags might seem like something you add to a picture of your morning coffee, but they can have a lot more power than that. As this list shows, ordinary people with a big idea can change the world if they’re committed and genuinely believe in the cause.

At the same time, hashtags can, in some cases, spread negative messages and hate. So, when tweeting one, make sure you use it for good and not bad.