A 25-minute propaganda video showing pictures of Zuckerberg and Dorsey covered with bullet holes was uncovered by Vocativ deep web analysts on the social-media site Telegram, which ISIS frequents.
The video is titled "Flames Of The Supporters," and ends with a direct threat to the two CEOs, according to the report.
"You announce daily that you suspend many of our accounts, and to you we say: Is that all you can do? You are not in our league," text on the video clip reads.
"If you close one account we will take 10 in return and soon your names will be erased after we delete your sites, Allah willing, and will know that we say is true," it is said.
Twitter said earlier this month it suspended 125,000 accounts "for threatening or promoting terrorist acts, primarily related to ISIS." Facebook has said that it works to ensure that terrorists don't use the site, and that it removes content supporting terrorism.
