Two very interesting documents concerning infiltration of social networks. The first one specifacally concerned with destructive manipulation of the English Defence League.

The obvious conclusion to be drawn from this is, that EDL might have to drop the prestigious "minority divisions" and rely solely on the real local divisions. Within these divisions members will have a traceable history within the community, which again make them much less vulnerable towards impostors and special-interest groups with divisive agendas.
Needless to say, this should not keep minorities from joining the EDL, but simply encourage them to join a division like any other Englishman would.

Thanks to the Tennesee Educator for raising this important issue

EDL Internal Security Monitoring

HACKING SOCIAL NETWORKS: EXAMINING THE VIABILITY OF USING COMPUTER NETWORK ATTACK AGAINST SOCIAL NETWORKS