  We analyze 26.2 million comments published in Arabic language on Twitter,
from July 2014 to January 2015, when ISIS' strength reached its peak and the
group was prominently expanding the territorial area under its control. By
doing that, we are able to measure the share of support and aversion toward the
Islamic State within the online Arab communities. We then investigate two
specific topics. First, by exploiting the time-granularity of the tweets, we
link the opinions with daily events to understand the main determinants of the
changing trend in support toward ISIS. Second, by taking advantage of the
geographical locations of tweets, we explore the relationship between online
opinions across countries and the number of foreign fighters joining ISIS.
