lurker
読むだけで参加しない人
ROM（read only member）
1% rule (Internet culture)
Astroturfing
Leech
Online participation
Socialization
computer-supported cooperative work
Parasitism (social offense)
Academic audit
slang.icon
/suto3/google.iconlurker
image lurker
define lurker
wikipedia lurker
weblio lurker
kotobank lurker
jisho lurker