Today is symbolic for an oft-forgotten group of Americans: Prisoners. 45 years ago, those locked away in the Attica Correctional Facility in western New York state went from protesting for more rights to a full-blown riot put down by force. In recognition, the incarcerated across America are rallying to protest the injustice of prison labor, which could become the largest mass-strike in US prison history. But how did they coordinate so many people using only written letters and telephones as restricted by law? Answer: they got around it and connected with each other — and the outside world — over Facebook, Twitter and YouTube.