noun
cyberstalker; online stalker
A person who persistently monitors, harasses, or intimidates someone through the internet or social media.
from English net stalker
ネットストーカーに個人情報を特定されて怖かった。
I was scared when a cyberstalker identified my personal information.
ネットストーカー対策としてSNSの
As a countermeasure against online stalkers, I reviewed my social media settings.