A key thing to keep in mind is that what is changing the Arab world is in large part very much like what happened in America and Europe in the 1960s. In the 1960s the children born in the decade after the Second World War entered adulthood. This was called the "Baby Boom." A large number of young people joined major protests against the Vietnam War or in Paris even tried to take over the government.
A established system that grew out of World War Two faced the consequences of the young people it had created. A period of demographic social change was driven by a large population of young people and new media technology.
For the young people in the Arab world Twitter and Facebook play the role that radio, LPs, and Rock and Roll did in the 1960s. In both cases a new generation with its own means of sharing experience and forming collective identity faced an established order born out of military struggle.
People in the west should think about how much more the Arab youth have accomplished than raised from the 60s. The revolts of 1968 in Chicago and Paris were essentially failures. In Tunisia, Egypt and Bahrain a massive effort has raised the hopes of much of the population.