#BBCtrending: Five facts about #BringBackOurGirls

The hashtag #BringbackourGirls has become a huge global phenomenon after the abduction of more than 200 schoolgirls in Nigeria. Here are five facts about the trend.

1. When did it start?

2. How many times has it been used on Twitter?

3. Where is it being used?

4. Who is using it?

5. Most shared tweet?

Images courtesy of Getty Images, Reuters, AP and @FLOTUS/Twitter

All our stories are at bbc.com/trending