Okay kiddo, so you know how sometimes people use the internet to talk to their friends and share pictures? Well, some bad people called the Islamic State of Iraq and the Levant (also known as ISIS) use the internet and a bunch of social media sites to share their message and recruit new members.
They use Twitter, which is like telling everyone in the world what you're doing right now, to share their scary message and make people afraid. They also use YouTube to show videos of their fighters being tough and powerful, which can make people think they're cool.
But that's not all, they're also able to use other social media sites like Facebook or Instagram to communicate with each other secretly, and even post pictures of themselves doing things other people might not like, like hurting others.
It's important to remember that not everyone who uses social media is bad, but we need to be careful about who we talk to and what we see online. And if we ever see something that worries us or makes us scared, we should talk to a grown-up we trust to help us understand and stay safe.