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2015 Hashtags of the Year Episodes Available now
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#BlackLivesMatter
The hashstag that galvanised a protest movement on a scale not seen since the 1960s.
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#TheDress
How a dress from Birmingham became the year's biggest talking point.
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#AylanKurdi
How one picture changed the nature of the debate about migrants in Europe.
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#JeSuisCharlie
How a fringe newspaper became a worldwide symbol for freedom of expression.
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#DistractinglySexy
Comments made by the Nobel scientist Sir Tim Hunt started a worldwide debate on sexism.