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Use "lurkers" in a sentence
"WALSH: Hey, a whole chunk of people listen to Rush that he calls lurkers, who really hate him ..."
"And you don't even need to be an active participant in the discussion: A 2008 study in the Journal of Medical Internet Research found that "lurkers" - individuals who read but do not post responses to online support group forums - reap the same empowerment benefits as active commentators."
"Knowledge management people know this, and the general category for the 90% is "lurkers" - people who are in the community but never appear to participate."