>> expect us. >> reporter: instead, anonymous is a loose group of internet hackers from around the world, making it much more difficult to know what they're going to do next and to stop them. lisa stark, abc news, washington. >> scary stuff. smart group. >> smart guys. coming up, questions about madonna's halftime performance. >> and the big theme in last night's super bowl ads. we'll be right back right after this. ads. we'll be right back right after this.