In pictures: Twitter's hashtag turns 10
#Memories: Twitter is marking 10 years of the hashtag with some of the best tweets since 2007
Globally, an average of 125 million hashtags are shared every day on Twitter, helping people on Twitter to see what’s happening in the world and explore what is being talked about right now. Here are a few of the most used hashtags over the years. 2007: #barcamp. On 23 August 2007, Twitter user Chris Messina @chrismessina posts the hashtag #barcamp, which marks the first hashtag on Twitter. 2009: #FF. On 16 January 2009, Micah Baldwin starts Follow Fridays (#FF). Twitter adopts the hashtag and adds hyperlinks. 2010: #WorldCup2010 Football World Cup in South Africa. Twitter emojis are introduced to the platform. 2012: Saudi actor @iMutlaq, tweeted about the availability of Arabic hashtags. 2014: #icebucketchallenge starts in July on Twitter. The word hashtag is also officially entered into the Oxford English Dictionary. 2015: #JeSuisCharlie / #PrayforParis became trending hashtags on Twitter after the terror attack in Paris. 2016: #PokemonGo, the infamous Pikachu and friends return as the game becomes popular again.