Couldn't they just run a sting (set up a account and sell)? When someone bids/sells, the other half of the transaction can do a search for the person's ph# and actual name. I've done it, as both a seller and a buyer.
Not sure if eBay would go for that.
I'm not sure of their cooperation record with authorities.
On that note, I'm sure the "powers that be" are doing whatever they can to find these terrorist cells.
I as a private citizen, however, am not foolish enough to expect the gov't to look out for my protection at every minute, and be lulled into a false sense of security. It's just common sense (growing up in So. Cal, unfortunately taught that lesson).
Being "aware" of one's surroundings doesn't take "puckering up" or "freaking out."