"This is how Hoda Muthana became an ISIS fanatic on Twitter. The 24-year-old 'ISIS bride' — who is currently in Syria begging to be allowed back into the US — ran off to join the terror group in November 2014 after being radicalized through the social media service, and posts on the site show how she interacted with other Islamic State enthusiasts in the months beforehand. According to the Counter Extremism Project, supporters of ISIS and other Islamic extremist groups often use 'variants of the words ‘kafir’ and ‘kuffar’ to refer to their Muslim and non-Muslim adversaries in online forums, as well as on social media and through various propaganda materials.' Twitter, along with other social media services including Facebook and YouTube, has come under fire for failing to stop ISIS and other extremist groups from using their platforms to spread propaganda and recruit new members."