Almost 200 billion tweets are sent per year. But for hashtags to go viral on Twitter, it often takes a combination of relevancy, a strong call to action and a little help from a small sample of the nearly 300 million global Twitter users.
It’s no different for those used by the global development community. We’ve laughed along with the rest of the community at hashtags used to collect and share the daily predicaments and conundrums of being a development professional.
But we’ve also seen hashtags harnessed in incredible ways, from creating global solidarity around the Ebola crisis, encouraging an outpouring of donations to victims of the Nepal earthquake and spurring public debate on the treatment of refugees and migrants.
Here are four of the most impactful global development hashtags we followed in 2015: