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2015 Hashtags of the YearEpisodes

    #BlackLivesMatter

    The hashstag that galvanised a protest movement on a scale not seen since the 1960s.

    #TheDress

    How a dress from Birmingham became the year's biggest talking point.

    #AylanKurdi

    How one picture changed the nature of the debate about migrants in Europe.

    #JeSuisCharlie

    How a fringe newspaper became a worldwide symbol for freedom of expression.

    #DistractinglySexy

    Comments made by the Nobel scientist Sir Tim Hunt started a worldwide debate on sexism.