Almost 30 per cent of recorded history, shared over social media such as Twitter, has disapeared, according to a new study of the Egyptian uprising and other significant events

On 25 January 2011, a popular uprising began in Egypt that  led to the overthrow of the country's brutal president and

Read more http://feeds.technologyreview.com/click.phdo?i=abdf5899cec7888524911a8b40a726d9