We live in an era of global agendas. The world, at least in terms of communications, has become smaller. With fax machines at hand the Chinese students caught up in revolt at Tiananmen Square could mobilise world opinion against state repression. This they could not have done only a few years before. So the communication infrastructure is in place.
Social movements have to know how to use it.
The main problem is not the hardware. The main problem is people. Individualism is one of the most dynamic aspects of western civilization. But it is also the worst. Individual gratification, individual greed, general selfishness these are the constraints to collective action.