The hashtag #JeSuisParis, used to show solidarity with the French capital in the wake of its second terrorist attack, marked the most talked of moment of the year on Twitter, according to the social media site.
Twitter has released its review of the year, and the I am Paris hashtag, with #PrayForParis, were the most used on the micro-blogging site in 2015 after two terror attacks in the city in 10 months.
This was followed by the Black Lives Matter movement, which began in the US and has become a social campaign discussing alleged police brutality against black citizens. The hashtag or phrase was used more than nine million times in 2015.
In both the US and Ireland this year, same-sex marriage was legalised nationally, and as a result #MarriageEquality appears third on Twitter's list.
Lewis Wiltshire, Twitter's director of media partnerships said: "2015 has been another phenomenal year on Twitter. Across the world people have come together to celebrate, support one another, to show solidarity and of course to laugh."
As refugees fleeing war in the Middle East flooded into Europe, debate raged on Twitter over how to manage the situation, with #RefugeesWelcome dominating the site enough to reach fourth on the influence list for the year.
This was followed by #IStandWithAhmed, a trend in support of Texas schoolboy Ahmed Mohammed, who was arrested when the ticking home-made digital clock he had in his bag was mistaken for a bomb.
Twitter's global users grew to 320 million this year.
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