Social media played a central role in shaping political debates in the Arab Spring. A spike in online revolutionary conversations often preceded major events on the ground. Social media helped spread democratic ideas across international borders.National Science Foundationhttp://deepblue.lib.umich.edu/bitstream/2027.42/117568/1/2011_Howard-Duffy-Freelon-Hussain-Mari-Mazaid_PITPI.pd