Mid-july Google changed the what backlinks they show. The command is virtually useless now.
I don’t think the backlinks shown have anything to do with being “credited” though… in fact, I don’t think the backlinks shown have anything to do with anything. In general, a selection of a page’s worst links are shown, while very very few of its best links. Many pages with only several PR5+ backlinks end up showing none.
When I say “virtually useless” there are a tiny few bits of info there now… you can see some super low quality sites that link to you that you know you don’t want to link to in a million years; you can see other domains that rely heavily on message board and blog links. In general, if your links have gone up a lot since mid July, that is NOT good. It means your percentage of very low quality links greatly outweighs your decent links.
On the other hand, it looks like a results tweak last week favored sites with tons of message board links, so maybe the display of links does mean google is favoring volume of links right now over quality of links, but that sort of favoring one thing over another is always changing.
Anyway, looking at backlinks used to be a very valuable thing to do. It’s a complete waste now. Use Yahoo instead…
linkdomain:http://www.site.com