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In the wake of the Boston bombings and manhunt, Over to You explores the role of social media. Jonathan Dyer, the editor of the World Service programme Boston Calling, asseses whether Twitter was a help or a hindrance to the investigation. Plus, we hear about the huge expansion of Egyptian media in the last two years from reporter Shaimaa Khalil, whose six-part series on Egypt started on the World Service last week.

(Image: Boston marathon runners and suspects Tamerlan Tsarnaev and Dzhokhar A. Tsarnaev. Credit: AP Photo/Bob Leonard)