What #bringbackourgirls teaches us about social media

Remember #bringbackourgirls? No? It’s over 100 days since a group of Nigerian schoolgirls were kidnapped by Boko Haram, prompting an outpouring of sympathy on Twitter. The great and the good lined to be photographed holding pieces of paper with the hashtag, including US First Lady Michelle Obama, UK Prime Minister David Cameron and an assortment…

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