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When I do a link:mysite, I get only 2 or 3 backward internal backward links from my own site out of the 90 or so links. This is for the homepage, which all pages in my site are linked to. I also know I have more than 2 or 3 internal pages with Pr4+, so they should all be listed.
Another site that links to me, I check out their backward links - I see 200+ links, but MOST of the links shown are internal.
What gives? is there any trick to this? I mean, what else can you do besides putting a link to your own home page? you'd think that'd be pretty brainless, but yet, google isnt listing them? (that wouldn't be too bad, if other sites suffered the same, but they don't!)
I see sites with thousands of backward links, and once you check on them, they are 90% internal links.
Help?!
How do you know? Just because the 'link request' only shows pr4+ does not mean they don't know about all the other links in. A site can get listed with a few external pr3 sites linking to it, but they won't show up as links in via google link request, but Google has found the site so logic dictates they know about the links.
Internal links probably help, if less than pr4, by a small amount of pr being fed back throughout the site and the anchor text used.
If you want backward internal links listed, your internal pages must have a strong PR by itself. Strong PR means that it must be able to pass enough PR to the other pages above an unknown threshold point. Generally low PR4 links don't make it, but high PR4 do. Similar cases for low versus high PR5 and above.
In other words, PR of the page just gives only the clue, but it is the "amount of transferrable PR" that would be accounted for as backlinks.
I only show 2-3 backward internal links, but I do have more than just 2-3 pr4 pages.
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Your question is understood, but it seems you don't understand the answer. To explain further:
No, it is not necessary for them to be all listed. It looks like you are assuming that all internal pages have the same real PR, but in practice, the real PR are not evenly distributed to the internal pages. In other words, each page in your site does not have the same real PR value, although each one of them got the same PR4 in the toolbar.
For example, lets assume that the PR4 threshold point between the low & high PR is 4.5 (an imaginary number as the actual value is not known). Only those pages at or above 4.5 will be shown as backlinks and they are high PR4, whereas those below this point will not, i.e. low PR4. The symptom that you describe suggests that the rest of your internal pages are of low PR4.
If you don't believe this, you can test this by yourself. Next time when you get inbound links - link them to one of your low PR4 pages that is not listed. Once this page gains PR above threshold point, you will definitely see it shine like the sun as your backlink!
There are months where one of my PR7 links or the other will not show up, but they are still counted, otherwise I would have a very noticable drop in the PR of the pages on my site.
In any given month, my link count can vary by an order of magnitude, but I never worry about it because it simply does not influence my ranking.
Running link: on your own site is pretty much useless, where you gain value from the link command is running it on your competitor's sites to find new places to get links from.
It used to be true in the past, but not today anymore.
>>> it should be 'Google shows only backlinks with pr4.5'(this being an unknown number)?
To avoid misunderstanding of PR4.5, better to say - it should be above the threshold point, ie. high PR.
To expand the things further and in my personal opinion, I also feel that Google has been imposing this threshold point, not only for PR4 but also for PR5 and those greater "but on different scale and degree".
As BigDave had said, even PR7 may not be shown as backlinks. Last time that I had look around, there are quite many PR7 & PR8 pages in my examining samples that do not show as backlinks. I guess because they are of low PR7 & low PR8. In other words, these low PR7 and PR8 pages might be able to pass PR, but not listed as backlinks and many people misunderstood that PR was not passed - this is quite a different story of blocked PR which is quite prevalent for PR8 and PR9.
so, a pr5 page with 100 links out gives too little pr per link for it to show as a back link.
Now, here's the interesting bit. why would a pr3 link show?
Perhaps other factors make that link important enough, rather than just pr.
As for those calculations of high and low PR, they don't matter much as far as SERPs. To me SERPs still are some sort of voodoo and the only thing you can do to improve your google rankings is get as many incoming links as possible and it doesn't really matter what PR they are. Any incoming link is good.