The protest movement in Egypt has mobilised the young and the middle classes using the Internet and social networks in a challenge to the authorities that has seen both Twitter and Swedish video-streaming site Bambuser blocked. Mobile phones too were unable to get a signal on Tuesday in Tahrir Square in the centre of the capital Cairo, which has been a rallying point for thousands of protesters. Pro-democracy activists countered on Wednesday by disseminating technical advice to overcome these obstacles to enable the mobilisation to continue.