blurker

plural blurkers

1. One who reads many blogs, but leaves no comments and does not have their own blog.

   Now, here’s the thing, my beloved blurkers[,] I’m longing for your comments like a little girl panders after Justin Beiber.

   2011 March 1, Grace Sandra, “Something that Makes me Smile: My blurkers”, in Patheos

   1 more example

   Ever met a blurker? That's boosted from lurker, "someone who reads a forum conversation but doesn't contribute," and in a blargon portmanteau means "one who reads many blogs but leaves no evidence of himself behind."

   2006 March 11, William Safire, “Language: Nifty gifties: Books full of words - Opinion - International Herald Tribune”, in The New York Times