opic at a meeting of the German Interior Ministery today. And it remains highly controversial. Some say investigations should only be made through public agencies, but Facebook is a privately run company.
In the video of James Foley being beheaded, his executioner is almost entirely masked - only his eyes can be seen. Despite this, investigators are following many leads as they hunt for his killer.
German justice ministers are discussing how to use social media to help in police investigations. Some police departments have already successfully tried the approach - but data protection authorities are very concerned.
With continuing protests against Prime Minister Recep Tayyip Erdogan's government in Turkey, there has been sharp criticism that traditional media have largely been silent. But what role have social media been playing?
A young Social Democrat politician spoke out against xenophobia at a rally of Germany's right-wing NPD party. The video of his speech became a YouTube favorite, even though - or because - the NPD is trying to ban it.
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