ISIS has threatened Facebook founder Mark Zuckerberg and Twitter 's CEO Jack Dorsey in a new chilling video.
In the 25-minute film extremists hackers claim they are fighting back against efforts by the social media giants to wipe their platforms of accounts promoting terrorism.
Pictures of the two founders can be seen being blasted with a hail of bullets in the amateur footage which emerged today.
The video, titled "Flames of the Supporters" and released by a group calling themselves "the sons of the Caliphate army", ends with a direct threat to the two men.
It says: "To Mark and Jack, founders of Twitter and Facebook and to their Crusader government.
"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," the voiceover continues.
"If you close one account we will take 10 in return and soon your names will be erased after we delete you sites, Allah willing, and will know that we say is true [sic]."
Part of the video also appears to show them hacking Facebook and Twitter accounts by changing profile pictures and posting ISIS propaganda.
The terrorists claim they've hacked more than 10,000 Facebook accounts, more than 150 Facebook groups and more than 5,000 Twitter profiles.
ISIS
ISIS
The accounts were mostly related to Islamic State activities and have been shut down over the past eight months.
Islamic State is known to use social media to radicalise and lure recruits, prompting Twitter to “significantly” increase the size of its reviewing team.
The company said it had already had seen “an increase in account suspensions and this type of activity shifting off of Twitter”.
But it added there was no magic formula for identifying terrorist content.
In a statement a Twitter spokesman said: “Like most people around the world, we are horrified by the atrocities perpetrated by extremist groups.
“We condemn the use of Twitter to promote terrorism.”
It comes after Facebook, Twitter and Google were told to help ramp up Britain's terror fight by MPs earlier this month.
The trio of tech giants faced a grilling in Parliament on the mammoth task of removing jihadi posts.
MPs on the Home Affairs Select Committee heard websites are expanding teams of staff who weed out extremists, recruiting Arabic speakers and using ex-FBI workers to fight the rise of ISIS.
British authorities asked Facebook for 4,489 account details in the first six months of 2015 – double the 2,337 for the same period in 2013.
Google was asked for 6,056 account details in the first half of last year compared to just 1,818 two years earlier.
Twitter received 299 requests in the first half of 2013 – but far more of its information is already public, MPs heard.
Facebook now has thousands of staff on its community team, including specialists on terror posts who work from its Dublin office.
And Twitter has around 100 people to deal with flagged posts and accounts, a number which recently tripled
YouTube, owned by Google, tries to remove posts within a few hours – but 400 hours of video are uploaded to the site every minute, the committee heard.
Facebook's Middle East and Africa chief Simon Milner said no system was perfect to spot offensive posts.
He told MPs: “We would love to be able to press a button to get rid of them but we can't.
“It takes a lot of effort, a lot of resource and a lot of intelligence.”
Source: Mirror