xix
Contents
6 Evaluation .......................................................................................... 62
6.1 Forum Accessibility Experiment .............................................. 62
6.2 Forum Collection Update Experiment ...................................... 63
6.3 Forum Collection Statistics ....................................................... 65
7 Conclusions and Future Directions .................................................... 66
References ................................................................................................ 67
5 Link and Content Analysis .................................................................... 71
1 Introduction ........................................................................................ 71
2 Literature Review ............................................................................... 72
2.1 Terrorists’ Use of the Web ........................................................ 72
2.2 Information Services for Studying Terrorism ........................... 73
2.3 Advanced Information Technologies
for Combating Terrorism .......................................................... 74
3 A Methodology for Collecting and Analyzing Dark
Web Information ................................................................................ 75
3.1 The Methodology ...................................................................... 75
3.2 Discussion of the Methodology ................................................ 77
4 Jihad on the Web: A Case Study ........................................................ 77
4.1 Application of the Methodology ............................................... 78
5 Results and Discussion ...................................................................... 87
5.1 Expert Evaluation and Results .................................................. 87
6 Conclusions and Future Directions .................................................... 88
References ................................................................................................ 89
6 Dark Network Analysis ......................................................................... 91
1 Introduction ........................................................................................ 91
2 Topological Analysis of Networks ..................................................... 91
3 Methods and Data .............................................................................. 93
4 Results and Discussion ...................................................................... 94
4.1 Basic Properties ........................................................................ 94
4.2 Small-World Properties ............................................................. 96
4.3 Scale-Free Properties ................................................................ 98
4.4 Caveats ...................................................................................... 99
4.5 Network Robustness ................................................................. 100
5 Conclusions ........................................................................................ 102
References ................................................................................................ 103
7 Interactional Coherence Analysis ......................................................... 105
1 Introduction ........................................................................................ 105
2 Related Work...................................................................................... 107
2.1 Obstacles to CMC Interactional Coherence .............................. 107
2.2 CMC Interactional Coherence Analysis ................................... 108
3 Research Gaps and Questions ............................................................ 113
4 System Design: Hybrid Interactional Coherence System .................. 114
4.1 Data Preparation ........................................................................ 115
4.2 HIC Algorithm: System Feature Match .................................... 116