I happened to come across this in the last few days, though I don't know from where it originates. I remember something similar last year - a call for people who read a blog and didn't comment just to check in.
It's a strange thing. Over the last year I've had more visits than ever to my blog, but just a few less comments. I wasn't expecting that. I love comments. I try to respond to them all, either by email or in my commentbox. I love to pop over to commenters' blogs to have a nosey round, too.
I manage it 80% of the time, I reckon. And even though I try to comment on blogs as often as I can as I know how important comments are to bloggers, sometimes I read blogs when I have a pan of something boiling on the hob and it is no time to be composing thoughtful responses.
Also, no-one got any Christmas cards from the Coffee House this year and this is entirely because they sat on the end of the radiator for three weeks and I never got round to buying them any stamps.
What I'm saying is, if I don't respond, it's not because I don't like you. It's just ineptitude.
So, if you're there, why not delurk. I don't need you to say anything meaningful. Just a wave would do.