My son had a little spat with one of his friends yesterday (nothing serious). The friend got one of his friends to spam my son on WhatsApp. It started off with a little bit of name calling, with my son replying asking who this was. The boy then sent my son a pornographic meme (he's 12). We were out together at the time and I saw it immediately as did he and he was really shocked. He told me later he felt a bit traumatised over it so we talked about it and he's ok today. He's now friends again with his friend and blocked the other boy.
My question is, where do I go from here? Tell the school? Tell his friends parents? Find out who the boy is and tell his parents? Tell the police? I think he deleted the chat but I'm going to have a look tonight, so no evidence as such