imaginary_number said:All they need is the IP address. There has been several defamation cases on some of the other forums I frequent - the forum owner is legally obligated to reveal the IP address. Many of these offenders were fined.
Not sure what happened to the person who masqueraded as PM Goh though.
If a prankster has ill intentions for libelous acts, he can easily do it in a cyber cafe. Then there's no way anyboby can track him/her down.