#Hashtag10: A brief history of the iconic Twitter symbol

how do you feel about using # (pound) for groups. As in #barcamp [msg]?

— ⌗ChrisMessina (@chrismessina) August 23, 2007

Chris Messina had no idea that his simple suggestion would become a unifying force for political movements the world over, as well as a means of displaying empathy and support in times of tragedy.

The “barcamp” he referred to is a user-generated conference, typically discussing tech or the internet.

The simple idea quickly spread to other social media platforms such as Facebook, Instagram and Tumblr.

Which hashtags have mattered most to you? #Hashtag10 pic.twitter.com/WyJvGpZXuR

— Twitter (@Twitter) August 23, 2017

To mark the 10-year anniversary of the wildly popular symbol, Twitter has created a special #Hashtag10, which adds a special emoji. Twitter’s 328 million monthly users share an average of 125 million hashtags.  

RT takes a look at some of the highlights of the now ubiquitous symbol on its 10-year anniversary.

Official recognition

The term “hashtag” was officially added to the Merriam Webster dictionary in 2014 with the meaning: "A word or phrase preceded by the symbol # that classifies or categorises the accompanying text (such as a tweet)."

Most popular hashtags

The most popular hashtag of all time, used over 1 billion times, allows users to recommend their favorite artist’s work, tagging it with #NowPlaying (or #np).

ok, Jackson Browne might've been a liiiiittle heavy for a Monday morning... ?... let's try again. #np pic.twitter.com/91GHB0GPtK

— hayley from Paramore (@yelyahwilliams) July 31, 2017

In a similar vein, #FollowFriday or #FF is the most popular hashtag tradition, with 539 million mentions.

Longest hashtag

This illustrious honor was awarded to Paul Horner, author of Super Official News, in 2013. The 345-character long hashtagtells a brief but highly controversial anecdote about Horner’s life.

Hashtags for charity

Hashtags have helped charities galvanize the global public like never before, raising awareness of some the world’s most important challenges.

Thanks @JonBullas. You're up next @KevinAylwin, Jeanette Senerchia and @mattdodson7 #IceBucketChallenge http://t.co/3jKEwvaxA2

— Chris Kennedy (@ckgolfsrq) July 15, 2014

The #IceBucketChallenge helped raise $100 million for Amyotrophic lateral sclerosis (ALS) research, in a viral campaign that showed how powerful a tool social media could be when using the right hashtag.

Hashtags as tools for political activism

Hashtags have helped unite citizens of the world across time zones and international borders to help spread awareness of numerous causes.

Our prayers are with the missing Nigerian girls and their families. It's time to #BringBackOurGirls. -mo pic.twitter.com/glDKDotJRt

— First Lady- Archived (@FLOTUS44) May 7, 2014

When Boko Haram militants kidnapped 276 girls from Chibok in northeastern Nigeria, #BringBackOurGirls was the rallying cry used by activists and concerned netizens around the world to call on Western leaders to secure their safe return.

While #BlackLivesMatter is arguably one of the best-known political hashtags in the world, it actually originated on Facebook.

Hashtags for solidarity

pic.twitter.com/5hr2brBJQt

— joachim (@joachimroncin) January 7, 2015