Times of India, Muslim extremists using Facebook, Twitter to radicalise UK students: Report, 28 May 2012 " Islamic extremists are using social networking sites such as Facebook and Twitter to radicalise British students and spread propaganda, according to a report.
"Campaign groups The Henry Jackson Society and Student Rights, in their report 'Challenging Extremists' have uncovered the online use of propaganda."
I haven't found this report online yet. I will update when it becomes available. There is a related report here: www.studentrights.org.uk, Online Radicalisation: A Case Study [pdf]
Update: the report is now linked here [pdf]