How one picture, showing three-year-old Turkish boy Aylan Kurdi dead on the beach, changed the nature of the debate about migrants in Europe. Show more
How a dress from Birmingham became the year's biggest talking point, as people debated which colour it was - dark blue and black or white and gold. Show more
The hashstag that prompted by a seeming escalation in police killings of young black men in the US and galvanised a protest movement on a scale not seen since the 1960s. Show more