you have to have friends to use this so you can send them boos and they can send you boos back, so if you have friends that are not willing to sign up, then its kinda boring. but you can also save boos and send them via text messaging. have fun!
it's a good knock-off snapchat - like with the filters and the friending. there's settings that the person can only communicate after getting a friend request. (for example: you can send a friend request and the app'll ask you to add a message like "this is sarah your friend from school!")