Looking for advice as I really don't know what to do about this.
DD1 is 13, she was going out with him for 6 months. He was very possesive, controlling and played mind games with her all the time. He dumped her via text about 2 months ago.
He posted some crap about her on fb which I asked him to remove, which he did. We have since discovered he has posted videos on you tube with him and another boy talking about how brilliant it would be if he could strap bombs to her back and blow her to fuck. He goes on in a similar vein for around 15 mins. He also talks about how they went to my place of work and ran in the door and yelled "wanker" 
I know this all sounds very childish but the thing is, he has linked it to fb so everyone can see it. She is so upset and humiliated. She has had a very hard time at school with bullying which led to self harming and feeling so low she had considered suicide. 
She has a few sessions with the school therapist which seems to have helped.
I dont give a toss about them coming to my work (I wasn't in that day) but it annoys me that they have mentioned several times who I work for and where it is.
I really do not know what to do? Do I talk to his parents? The school? Or the Police? Im not sure if I am over reacting and this is just stupid wee boys mouthing off. But this is my beautiful clever sensitive daughter he is talking about. And she doesn't deserve any of this. She cried herself to sleep last night and I'm worried that she starts to hurt herself again.
So I suppose the AIBU is, can I say or do anything? My gut reaction is to speak to parents although they are very intimidating or the school.
DH wants to go to the police but I feel that they would think we would be wasting their time. Any advice would be welcomed.
Sorry this is so long btw, thanks if you made it this far.