The BBC has been tracking the stories of the men, women, boys and girls who have gone to Syria and Iraq to understand why they go, where they go from and what happens to them. By analysing around 160 profiles, it reveals the way in which people have travelled in clusters - a group of three young friends from Coventry, another group from Portsmouth, drawn out by one person they knew, others in Cardiff linked to people involved in an extremist organisation.
Social media might play a part but face-to-face contact appears just as, if not more, important, according to the database.
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