As we see 2015 drawing to a close, Twitter have released details on the most used hashtags on the site in the last 12 months. They range from the dress optical illusion that plagued us all earlier in the year to messages of support for the people of Paris in the wake of the attacks last month.

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#ParisAttacks Twitter lit up in solidarity for the victims of November's terrorist attacks using the hashtag #PrayForParis, while others also used #PrayForSyria in an effort to highlight the casualties of conflicts all around the globe.

#hommagenational ?? #Republique ?? #PrayForParis ?? #JeSuisParis ?? #jesuisbataclan ?? pic.twitter.com/7tuE5Dp7El

— JohnNico75 (@JohnNico75) November 27, 2015

#BlackLivesMatter The social justice movement of politically conscious African-Americans has dominated the news in the US and indeed globally. The campaign has been highlighting injustices committed against the black community by law enforcement and other authorities, and looks set to continue to rally for fairness, safety and accountability.

THIS PIC & THAT T-SHIRT are giving me all the life #BlackLiveMatter ♥♥♥ MT @deray #Ferguson. #McKinney. pic.twitter.com/UzkSyqg3ut — liza sabater (@blogdiva) June 9, 2015

#MarriageEquality The world made some significant advances in terms of LGBT rights with our own referendum in May, and the overturning of DOMA in June in the United States. Twitter of course celebrated these human rights victories and here in Ireland #hometovote brought a tear to many of our eyes.

#hometovote #MarRef Print now available here http://t.co/P3rZIaBSS0 All profits go to @SpunOut pic.twitter.com/ApdMbkX7kb

— Annie West (@anniewestdotcom) May 24, 2015

#RefugeesWelcome After the shocking photo of three year old Aylan Kurdi washed up on a Turkish beach, the global community was galvanised into showing their support for the many refugees fleeing conflict in the Middle East.

#Canada is to admit Alan Kurdi family members, according to his aunt https://t.co/ufud1gK6sE … #cdnpoli #refugeeswelcome — Avinash Gavai (@Rantaramic) November 28, 2015

#IStandWithAhmed When Ahmed Mohamed was arrested at his Texas school on suspicion of possessing a suspicious device, it turned out he had just assembled a clock to show his classmates and Twitter was disgusted at the Islamophobic nature of the incident.

Ahmed the Clockmaker Meets President Obama https://t.co/sFUFZbqd9q - #IStandWithAhmed

— Aneesh Varma (@AneeshVarma) October 20, 2015

#FIFAWWC The Women's World Cup was one of the biggest sporting events of the year with tweets about the tournament viewed almost 9 billion times.

World Cup Winner Abby Wambach Named Out Magazine’s Athlete of | https://t.co/uP4PFZvJlm #LeifEngstrom pic.twitter.com/S97TUVw4L3 — Artarius Media (@ArtariusMedia) November 10, 2015

#PlutoFlyBy We were all in awe of the terrifying wonder that is space when a NASA spacecraft generated some beautiful close up images of the planet.

#TGIF. Enjoy the best pics humans may see for decades of #Pluto, courtesy our #PlutoFlyby. https://t.co/mXmKxaTHik pic.twitter.com/hJYI5q4hnE

— NASA New Horizons (@NASANewHorizons) December 4, 2015

#TheDress WAS IT BLUE OR GOLD??? HELP.

#whiteandgold or #blackandblue? We found a way around science- you can have both! #TheDress #dressgate pic.twitter.com/5oj3ZTqOWk — LEGO (@LEGO_Group) February 27, 2015