This is an article about an Australian games reviewer, and local journalist: Alanah Pearce (Radio-JJJ games reviewer), who decided to give under-age trolls a taste of their own medicine. She must have tracked-down their identities (I'm guessing via IP addresses, and a search on social-media), and notified their mothers.
You have to admire Alanah's ingenuity in tracking-down the perpetrators.
*Click-on the link below to view article in full:
http://www.dailymercury.com.au/news/young-reviewer-takes-rape-threats-telling-their-mu/2471561/