We’ve seen them now in the squares of Tunis, Cairo, Istanbul, New Delhi, Damascus, Tripoli, Beirut, Sana, Tehran, Moscow, Rio, Tel Aviv and Kiev, as well as in the virtual squares of Saudi Arabia, China and Vietnam.The latter three countries all have unusually large numbers of Facebook, Twitter or YouTube users, or their Chinese equivalents, which together constitute a virtual square where they connect, promote change and challenge authority. The most popular Vietnamese blogger, Nguyen Quang Lap, has more followers than any government newspaper here. In Saudi Arabia, one of the most popular Twitter hash tags is #If I met the King I would tell him.”