Unmatched Ad Requests?

Google's google.com/adsense/support/bin/answer.p mentions that as a possible cause for high "unmatched".

If you're using link units on your site, unmatched ad requests might be higher than expected. This is due to the way we count a matched ad request for link units. A matched ad request for a link unit is only counted if the user clicks on a term in the link unit.

If the user doesn't click, the ad request is considered unmatched. As a result, coverage is lower for link units than other ad units.

PC, most of these are from Hubpages. I have opted out of the HP Ad Program right now and am trying to make it through Adsense. I wonder if it is related to the ads above the title that only show when we are logged out.

As a Hubpages writer, we don't have a choice as to which ads are chosen. But I wonder if this is something that is common to a lot of Hubbers or something I am doing specifically. Curious ...

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.