Excerpt:

On Twitter, Ali Shukri Amin was on his way to becoming a giant within the online jihadist community.

Under the alias @Amreekiwitness, the Virginia teenager pumped out more than 7,000 tweets in support of the self-proclaimed Islamic State and its radical agenda.

In one of his best-known pranks, he superimposed the group's iconic black banner onto the flagpole atop the White House in an online image. He heralded the organization's "upcoming conquest of the Americas."


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