File photo of a Twitter logo in this photo illustration taken in the central Bosnian town of Zenica

Reuters
File photo of a Twitter logo in this photo illustration taken in the central Bosnian town of Zenica
Men are silhouetted against a video screen with a Twitter logo as they pose with Samsung S3 and S4 smartphones in this photo illustration taken in the central Bosnian town of Zenica on August 14, 2013. REUTERS/Dado Ruvic/Files
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