Listen: ISIS and modern terrorism online

Britain's Prime Minister Theresa May wants countries to work together and rid the internet of "safe spaces" that allow extremist ideology and recruitment.

"That's just what the internet is: a place where everyone, even the worst people on the planet, can speak," said Graeme Wood, author of "The Way of Strangers: Encounters with the Islamic State."

May wants companies like Facebook and Twitter, where ISIS has been able to recruit for and applaud terror attacks, to monitor where radicalization is breeding.

However, it's not just large media companies that house these activities.

Charlie Winter, a senior research fellow at the International Center for the Study of Radicalisation, told MPR News host Kerri Miller that other smaller media organizations, like the messaging app Telegram, are where ISIS goes to push its propaganda.

"In the course of the last few years ... Twitter has transformed its platform," said Winter.

It's much harder to be an extremist on that site, Winter said. So, May's call to "the big companies" might not make the impact it should.

"I worry that nuance has been lost on the conversation," said Winter.

To hear more about how extremist organizations operate online, use the audio player above.