72 hours before the attacks occurred it has been confirmed that via social media ISIS was discussing the attacks. 3 hours before the attacks facebook banned the anonymous group page on facebook that got thousands of ISIS accounts exposed/closed.
This wasn't just addressed by them, FOXnews did their report.
72 hours before Paris attacks, ISIS-linked social media account reveals 'God bless you in your mission'
Fox News has learned that four credible, ISIS-linked social media accounts began sharing messages 72 hours before the Paris attack, including images of weapons, the Eiffel tower, as well as blessings for the attackers’ mission. A military intelligence source says the social media traffic is now seen as evidence the three teams had gone operational.
The translations include “God bless you in your mission” and “Support the deployment,” as well as a reference to our “sister,” suggesting an operative, or member of the support team was a woman.

