The whole history of the 20th century is a history of resistance groups which are either nationalist or, in large parts of the Muslim word, religious groups.
I do think the Cubans have to change some of the political structures there and allow critical voices, for their own sakes, because unless there is accountability the revolution will totally atrophy.
I think Syriza and Podemos are very, very different from Sinn Féin in many ways, and so I wouldn't put all three together. I would say that Syriza and Podemos are movements which have come out of mass struggles. In the case of Podemos, directly out of tariqaliextremehuge mass movements in Spain, which started with the occupation of the square. In Greece, as a response to what the EU was doing there, punishing it endlessly, for the sins of its ruling elite.
The Internet has been an invaluable acquisition. I wonder how we would do without it. Information can be sent from one country to the other within the space of minutes, crossing channels, crossing oceans, crossing continents. But still, we can't compete with the might and power and wealth of those who dominate, control, and own the means of the production of information today.