Ali Shukri Amin, 17, from the small town of Manassas, an hour’s drive from Washington, will be subject to a lifetime of supervised release and monitoring of his Internet activities.
He is thought to be the first minor convicted in the United States of providing material aid to the extremist group.
The prolific Twitter user, who sent more than 7,000 messages on the site in support of IS, pleaded guilty in June. Under the Twitter handle @Amreekiwitness, he provided IS supporters with instructions on using the virtual currency Bitcoin to conceal financial donations to the radical Islamist group and the best way to encrypt their online exchanges.
He also offered guidance to sympathisers seeking to travel to Syria to fight with IS, including another Virginia teen, Reza Niknejad, who travelled to Syria to join IS in January. Niknejad, 18, was charged in June with conspiring to provide material support to terrorists, conspiring to provide material support to IS and conspiring to kill and injure people abroad.