There are many levels of intrusion. I give Anon enough credit that they might be able to cause some mayhem, maybe even some real harm. Maybe they'll take down Facebook Chat (to the great ambivalence of everyone)... but to 0wn/DDoS the main Facebook site altogether? I dunno...

It's like, I may be able to find some way to force all the toilets at CIA Headquarters to back up. That's not the same thing as compromising their spies' identities. Not all exploits are equal.