Radiohead guitarist Ed O'Brien has praised the influence of social network sites Twitter and Facebook.

In a recent post, entitled 'The Dignity Revolution', O'Brien hailed the influence of Twitter and Facebook on protests around the world.

"It's in the arena of public protest that it seems Twitter and Facebook are increasingly the means by which popular movements throughout the world are able to come together and mobilise."

He added: "I have been so moved by the peaceful Jasmine revolution in Tunisia; The anti-Government demonstrations centred on Tahrir Square in Cairo."

"Social networking has helped facilitate the freedom to assemble peacefully and express oneself."

Meanwhile, Radiohead star Jonny Greenwood is to release his score for the film, Norwegian Wood.

(by Holly Frith)