read the news of a clinic assistant working in SG getting charged under s 233 of Communications and Multimedia Act 1998.
(1) A person who — (a) by means of any network facilities or network service or applications service knowingly — (i) makes, creates or solicits; and (ii) initiates the transmission of, any comment, request, suggestion or other communication which is obscene, indecent, false, menacing or offensive in character with intent to annoy, abuse, threaten or harass another person; or
(b) initiates a communication using any applications service, whether continuously, repeatedly or otherwise, during which communication may or may not ensue, with or without disclosing his identity and with intent to annoy, abuse, threaten or harass any person at any number or electronic address, commits an offence.
be really careful with what you write online about other people and understand the legal risk of abusing or bullying another individual. there's no such thing as absolute freedom of speech on the internet whether you like it or not. On top of this law there's also Criminal Defamation under the Penal Code.