The Islamic State has lost thousands of fighters to death or prison and suffered the demise of its self-declared caliphate in Iraq and Syria. But the global reach of the group, also known as ISIS, is still vast, in part because of its sophisticated media output and the people around the world who consume it.

On New Year’s Day, a man with an Islamic State flag killed at least 14 people when he drove into a crowd in New Orleans. Authorities say there was no evidence that the man, Shamsud-Din Bahar Jabbar, had active connections to the terrorist group. But the F.B.I. said “he was 100 percent inspired by ISIS.”

It is not yet clear which specific online content Mr. Jabbar may have seen or how else he may have been radicalized. Experts noted that the placement of the flag on the truck resembled one depicted by ISIS in a media campaign urging followers to “run them over without mercy.” And, authorities said, he posted several videos to his Facebook account before his attack in which he pledged allegiance to ISIS.

From online videos to social media platforms — and even a weekly Islamic State newsletter — the group that wants to force all Muslims to adhere strictly to the faith’s earliest teachings has a very modern media strategy.

In the dwindling days of a spectacularly dreadful season, many White Sox fans are averting their eyes. On Sunday, the team lost for the 120th time this year, tying the major league record for most losses by a modern-day team in a single season.

Mr. Boileau was arrested on Friday and released on $30,000 bond on Saturday, his attorney, Jimmie Sparrow, said.

“Terrorism is essentially communications,” said Hans-Jakob Schindler, a former United Nations diplomat who is the senior director of the Counter Extremism Project, a think tank with offices in New York and Berlin. “It is not warfare, because obviously, ISIS cannot militarily defeat the West, right? They tried and it didn’t exactly end well.”

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