I miss when Anonymous was more about trolling the general public and less about solving humanitarian issues.
Still though, with Anonymous basically blockading all of their ports for new recruits via the internet, it seems like ISIS isn't going to have a lot of power anywhere outside of their own walls.
On the other hand, Anonymous can't do much about any ISIS sleeper agents posing as refugees already inside the borders like the people who attacked Paris last week. Unless of course ISIS is stupid enough to not privately communicate while they're being closely watched.