Check out the new piece my colleagues and I wrote for the peer-reviewed academic journal Perspectives on Terrorism: "The YouTube Jihadists: A Social Network Analysis of Al-Muhajiroun’s Propaganda Campaign"

This article was originally thought up and written about a year ago, but there have been some updates through the editing process along with a postscript from this past November. For a preview, here is the abstract:
Producers of Al-Qaeda inspired propaganda have shifted their operations in recent years from closed membership online forums to mainstream social networking platforms. Using social network analysis, we show that behind the apparent proliferation of such sources, YouTube account holders associated with incarnations of the British al-Muhajiroun collude to post propaganda and violent content. European groups commonly use American platforms and domain names registered with American companies. Seeking shelter under speech rights granted by the First Amendment, they evade European laws against incitement and hate speech.
Click here to read the entire piece.