T J McIntyre is a law lecturer and solicitor and has repesented Digital Rights Ireland. You can see his very worthwhile blog here.
He writes on IT and the law surrounding new technologies and media. He provided a comprehensive over of the laws that govern social media behaviour in Ireland which you can read here and here.
You can see the presentation and overview of the Irish law that covers social media below:
Social Media and the Law: Presentation to Joint Committee on Transport and Communications by TJ McIntyre
Also see the Written submissions on abuse in social media made by TJ McIntyre on behalf of Digital Rights Ireland below: