TJ McIntyre writes:
David Robinson and Harlan Yu have posted a superb series of posts on Freedom to Tinker (1,2,3) about tactics which might be used to identify anonymous internet posters, even in cases where IP addresses might not have been logged by the site which hosts the comment. The key insight is that sites typically embed multiple external services (such as advertising, stats counters and video hosting) which may either individually or in combination enable the identity of particular users to be pinned down…
Read more on IT Law in Ireland.