DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   lurking
   lurk
   lurker
      <messaging, jargon> The activity of one of the "silent
      majority" in a electronic forum such as Usenet; posting
      occasionally or not at all but reading the group's postings
      regularly.  This term is not pejorative and indeed is casually
      used reflexively: "Oh, I'm just lurking".  Often used in "the
      lurkers", the hypothetical audience for the group's
      flamage-emitting regulars.
      Lurking and reading the FAQ are recommended netiquette for
      beginners who need to learn the history and practises of the
      group before posting.
      (1997-06-14)