The pop stars tweeting about Sudan

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What links pop stars like Rihanna, Cardi B and Davido? You might be surprised to find that it is Sudan. All of them have been posting on social media about the killing of protesters in Khartoum who want the army to hand over power to a civilian government but how helpful is it to the demonstrators' cause? Sara Alhassan is a Sudanese-American writer and editor in Arizona. (Picture: Sudanese protesters. Credit: REUTERS/Mohamed Nureldin Abdallah)