This article cites an increased usage by Pakistani terrorist groups, such as the Taliban, on Twitter and Facebook as a means for communicating with each other, but also for disseminating propaganda among its members and possible future members.
“The Jamaat-ud-Dawa (JuD), declared a front for the banned Lashkar-e-Taiba by the UN Security Council after the 2008 Mumbai attacks, has a dedicated media wing that posts updates on its activities on social media networks. ‘Sophisticated terrorist organisations like the TTP and al-Qaeda realise that, in addition to violence, propaganda is needed for the successful orchestration of their activities,’ a recent article by writer Fawad Rehman said.” (Economic Times Feb 16,2014)
http://articles.economictimes.indiatimes.com/2014-02-16/news/47379667_1_media-houses-dedicated-media-wing-propaganda