#BBCtrending: What happened to #BringBackOurGirls?
In April more than 200 girls were seized from a boarding school in northern Nigeria by Boko Haram fighters.
The incident sparked one of the biggest social media campaigns of the year - under the hashtag #BringBackOurGirls - which called on the authorities to do more to free the girls.
Five months on, the hashtag is still trending, and has now been used more than five million times. BBC Trending looks at how the hashtag has developed over time.
Produced by Greg Brosnan and Ravin Sampat
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