Another offensive declaration from ISIS terror militant group against the West, this time it's directed Twitter's co-founder Jack Dorsey, who founded Twitter together with Noah Glass, Biz Stone and Evan Williams in 2006. ISIS, with its campaign of founding a caliphate of an extremist state across Syria and Iraq, has posted countless terrorizing statements and links to human's beheadings and other atrocious pictures and videos.

In response to that all ISIS members' Twitter accounts have been regularly shut down, although later on the group always finds a way to make other Twitter accounts..

This led to an online threat by ISIS towards Jack Dorsey that also posted his matted photograph with a bullet target between his two eyes on his upper nose last Sunday saying in Arabic , "your virtual war on the internet will cause a real war on you," under a headline "Foundation for the conquest of Jerusalem for the Islamic State," and "Twitter a target for the caliphate."

The post further remarked, "Jack, how will you protect your helpless employees when their necks are on the line and they become an official target for soldiers of the succession and their supporters among you? What will be your response to their families and sons, and their plight in this failed war? From the beginning of this failed war, we've said that this is not your war. But you did not understand and kept closing our accounts on Twitter, but we always come back."

In response, the social media site that has more than 500 million users replied by posting a note saying, "you may not publish or post direct, specific threats of violence against others...also banned any unlawful purposes or in furtherance of illegal activities."

A security team has been formed by Twitter and it is now trying to find out the validity of the threat with the help of relevant law enforcement officials.