IS Members Hail Death of James Foley

From Twitter to Tumblr, many of the young men who have joined the Islamic State have been documenting their paths to jihad and encouraging other Brits to follow them. 

They boast about their exploits, show off their weapons and try to provide a religious justification for their actions. This has allowed those who monitor them to build an extensive database on their activities and possible identities.
As the news of James Foley's death spread, some British fighters reacted with glee. A number replaced their Twitter avatars (the picture that account holders use on the profiles) with pictures of the beheading. LINK