decided to get revenge? who is going to be -- we don't know it yet but he's going to be the next name we know? >> several ways, actually that none of them are foolproof. a lot of it is dependent upon people, you see something, say something. >> red flag. >> not that police that smart but we get a lot of good information, tips from the public. so whether it's from traditional crime or this specific type of crime, very dependent upon people passing information on and often times, that allowed the police to open the investigation in open source analysis of social media and in the world of social media, it has opened up for law enforc enforcement many avenues of investigation.