btw- not limited to ISIS, and it never was.
https://www.youtube.com/watch?v=gr7d1sTDNts
Please note, in the images they show, it's the "radical Islamists" that are throwing them from the rooftops, while the "moderates" watch below for entertainment, and throwing the occasional rock to make sure they are dead.
Should we move on to how great women's rights are under Muslim's?