#AskHerMore
JANUARY
Popularized by celebs such as Reese Witherspoon, Shonda Rhimes and Amy Poehler to demand that people stop focusing so much on women’s appearance
#JeSuisCharlie
JANUARY
Started to voice support for the victims of the Charlie Hebdo shooting (alongside #JeSuisAhmed)
#LoveWins
JUNE
Shared by millions after the U.S. Supreme Court ruling that legalized same-sex marriage
#YouStink
AUGUST
Inspired violent protests after residents of Beirut used it to blast the government for failing to collect trash efficiently
#StandWithPP
AUGUST
Took off amid efforts to defund Planned Parenthood, thanks in part to support from Kerry Washington, Lena Dunham and Elizabeth Banks
#RefugeesWelcome
SEPTEMBER
Spread by activists petitioning David Cameron to let more refugees into Britain, and supported by President Obama, Madeleine Albright and others
#IAmAChristian
OCTOBER
Tweeted by Ben Carson to unite the conservative base following reports that the Oregon college shooter was targeting Christians
#ConcernedStudent1950
NOVEMBER
Started by students at the University of Missouri to protest what they say is growing racism on U.S. campuses
#ItsJustACup
NOVEMBER
Mocked social-media users who were upset that Starbucks’ red holiday cups did not have Christmas imagery
#PorteOuverte
NOVEMBER
Used by Parisians to find and offer housing for people who needed shelter after the ISIS attacks
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Write to Olivia B. Waxman at olivia.waxman@time.com