CAIRO, EGYPT - JANUARY 27:  A man looks at a laptop computer displaying Twitter in a cafe on January 27, 2011 in Cairo, Egypt. People across Egypt have used Twitter and other social media to mass organise protests with the searchable hashtag, #jan25. Thousands of police are on the streets of the capital and hundreds of arrests have been made in an attempt to quell anti-government demonstrations.  (Photo by Peter Macdiarmid/Getty Images)