that might tip them off to future attacks overseas or at home. >> allowing them in the future also to be able to look for certain motives or certain key indicators that may be able to prevent this or be able to be spotted online before it happens. >> reporter: twitter and facebook promised to remove any support for terrorism, but often it's too late. by the time facebook noticed malik's support for isis the attacks were under way. tom costello, nbc news, washington. and with me in the studio is senior editor of senior and digital media content. if the attacks turn out to be isis inspired does that only add more fuel to the terror propaganda? >> absolutely. that would be beyond their wildest dreams. they have two people who build bombs silently with great operational security, know hough to burn and destroy cell phones, during the attack. if isis didn't direct this, which there's absolutely no evidence they didn't, in fact we