Europe has witnessed several terrorist attacks over the past years. Several attacks in other parts of the world as well prove that radical Islamic groups no longer impose just a local threat in the Middle East, but rather a global danger. A number of adolescents from Western countries have joined the jihadist movement, and much of the recruitment seems to happen within small groups, and through social interaction based on face-to-face contact. However, many of those who have travelled to the conflicted areas in the Middle East also seem to have been active online. Previous research suggests that online contact gives an opportunity to establish radicalized identities, and that social media provides tools to create online communities. Previous research also point to ideological and political motivational factors, as well as marginalization-, group- and social network theories, when seeking to explain recruitment and involvement within war conflicted areas. In this thesis I use social media forums to study the online performance of radical jihadists. Data from three types of media are used: Twitter, Ask.fm and Tumblr blogs. My material sums up based on citations and texts from 15 different Twitter accounts, 10 profiles on Ask.fm and 5 Tumblr blogs. Twitter is a social media forum, or a so-called “micro-blogging service” where the online users can write short and personal messages on their profiles, and share their messages or information to other users. Ask.fm is also a social media forum, but the technological features are quite different. The forum is based on online users asking each other questions, and having their questions answered. The Tumblr forum, is based on “blogging” which means that the users create their own personal website, where they can share information and write texts, and post pictures. All of these forums provide the user with an ability to be anonymous, or choosing a nickname and portray a certain online identity. My main finding is that the forums are used quite differently. Twitter provides followers with ideological Islamic propaganda. Rhetoric based on violence and threatening messages is used, sparkled with youthful language, irony and sarcasm. Ask.fm is used in a different manner. The forum enables an opportunity to ask questions and chat with a jihadist. It is typically used to attain practical information before waging for jihad in Syria. The jihadists reply in an“understanding” way. Finally, the Tumblr blogs can be described as something “in between” Twitter and Ask.fm. These blogs provide both a scene for texts and pictures. Here as well, questions may be asked. Tumblr blogs seem to be visually more violent than the two other forums. There seems to be moderators and some censorship on Twitter and Ask.fm. However, this seems to be lacking on the Tumblr blogs. Combined, these forums may create a larger ‘cyber community’. Here, identities, fellowship and trust might develop. Most users are young men, and these forums also provide opportunities for performing masculinities, and they give support for violence. Moreover, actors within this cyber community skillfully promise young men a unique brotherhood and membership in a tight Islamic community. I conclude that the jihadists, or radical Islamic sympathizers, by means of these three forums provide their online followers a whole “package for jihad.” As well radical Islamic identities, practical guidance when waging jihad, and membership of a “true brotherhood” as foreign fighters might result from the complex cyber community analyzed in this thesis.