One example of a comment that I hoped would get an answer (I didn't care particularly whether or not it got an upvote, but it is an answer to your question) is my comment

http://news.ycombinator.com/item?id=967351

asking in full, "What online sources would each of you recommend as better articles on the meme concept and the strengths and weaknesses of that concept?" Alas, that comment received no answers, even though some other comments in the same thread had implied that some participants had read better sources than the submitted article that opened that thread.

I detect missed irony here.