>>i am 17, hes 19. im classed as a teen/child still. he is classed as an adult. Sending pictures like that to children over the internet IS against the law actually.

Then you had best tell your mum, and ask her to call the law on him.

>>After my mature replies of "thats not going to happen" he sent me a very vulgar message

So you're a mature child? Had you not sent him those "mature replies," he wouldn't have sent you that "vulgar message," would he? Any time you respond to a troll, you're giving him all the ammunition he needs. The Block User function is your means of preventing such situations. Use it.

>>Sending pictures like that to children over the internet IS against the law actually.

Yes, it is. But he didn't send you a picture, he sent you a link. You clicked on that link. Most 17 year old "children" in this day and time know that it's dangerous to click on unknown links from people you don't trust. You do it at your own risk, or you tell your mum to click on it on your behalf.

>>i also suspect this person to be some sort of online sex offender or some sort of paedophile?

Accusing people of such a thing based on a simple battle with a troll can often lead to serious trouble. You have no basis for such an accusation.

>> Is their any action i could take myself regarding the law?

No. You're a child, remember? You have no rights under the law. Any action would have to be initiated by your mum.

>>and through research, i found many users hes arguing with, that he could potentially o the same thing.

And these "many users" that he's arguing with are, I'm certain, capable of dealing with him on their own terms. They have access to the same "Block User" button you do. Your intervention is not required.