plural lurkers
Definition of lurker
1
: one that lies hidden in or as if in ambush
a lurker in the shadows It troubled me that there should have been a lurker on the stairs, on that night of all nights in the year …— Charles Dickens
2
: a person who reads messages on an Internet discussion forum or social media platform but does not contribute
Online fandom was a world where people were having conversations about the things they loved. For more than a decade, I was listening to the conversations, but I didn't say a word. I was a lurker.— Elizabeth Minkel
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Merriam-Webster unabridged
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Time Traveler for lurker
The first known use of lurker was in the 14th century
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