Harassment Trakasserier
Repeated unwanted contact or attacks directed at a person online. Distinguished from one-off rudeness by its persistence and, often, by several people coordinating.
Typical forms: brigading, where a group targets the same account, mention spam, doxing (publishing a home address or workplace), revenge porn, swatting and persistent cross-platform stalking. Platform countermeasures are blocking, muting mentions from unknown accounts, restricting who may reply, word and image filters, and reporting. They work less well than they sound, because the cost of creating new accounts is near zero while the burden of evidence falls on the target. In Sweden the behaviour can fall under unlawful persecution, molestation or unlawful invasion of privacy — the last of which was introduced in 2018. Save screenshots with timestamps and URLs before you block.