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I have another content-rich site with a ton of .edu's and mom & pop sites in it's backlinks, and it's not indexed well at all by Yahoo. I added a sitemap to it last week and Google indexed over seven thousand additional pages of 100% original content. Yahoo doesn't yet know it's there.
I'm fairly certain it's because the kind of websites that comprise my backlinks don't change very much, are sleepy or don't have a lot of good backlinks themselves, and Slurp doesn't favor them.
So I'm going to experiment with the backlinks and see what happens.
In my experience, it's the the links plus the content. But I have sites that do well with minimal content, pretty much because of the links. Like I have said before, one really good link is enough to push a good content rich site up there. One link.
Freq---
Also, I think that Tim has indicated that sites with good/better indicators of quality (e.g., backlinks) tend to get crawled more deeply.
But I'm not sure that either of these explain completely why some sites are not being crawled or featured much at all ... or why some sites have some subpages shown in the SERP's while other subpages of equal value are not shown.
My guess WRT sites having little or no luck in Y! is that it has something to do with site or IBL elements that Y does not like. An example would be like MB's comment re META tags. We had a site that could not get ranked in Y! despite doing well elsewhere. We did a site review and decided there was an issue with too-common META tag elements across pages. Once fixed, the site flew into top spots in the SERP's.
As I mentioned not all of my sites are well indexed by Y!. The ones that are well indexed by both G$ and Y! I attribute to good backlinks from a variety of sites. The anomoly is the first site I mentioned which is still very new (less than 4 months) with minimal backlinks but is extremely well indexed by Y!. I have not been able to figure out exactly why Y! has crawled and indexed this site so deeply. The site in question was heavily crawled by slurp literally within 2 weeks of going on-line. At that time I had less than a handfull of backlinks. The site consists of primarily unique content that is updated a few times a week. Slurp visits for a deep crawl about twice a month at most.
My first best guess is that one of my backlinks just happened to go live when Slurp was actively deep crawling that site. My second best guess is that I managed to dodge any sort of Y! "sandbox" penalty (by receiving no more than 2 or 3 back-links per week.)
I think a new site with a ton of backlinks right off the bat must trip a lot of flags with Y!.
Freq---
I experimented with unique IP addresses and that hasn't made a difference. I still lean to the backlinks as a reason, but others have privately suggested that a site living on a server with hundreds of other sites may slow it down, but I'm not sure about that.
For what it's worth, I mentioned above that I had a site that didn't get adequately spidered. Well, I gave it a link from a site that I know Yahoo likes, and about 500 out of 7,000 new pages were recently indexed. Google indexed more. I'm of the opinion that the quality of backlink (and I use the word "quality" loosely) is important. I'm going to add more links and see what happens.
I also had an affiliate site put up shortly after the aforementioned site that was shaping up to be very popular with Y!. Unfortunately due to some "issues" the entire site had to be dumped and started a-fresh. This site featured an amazon feed script (had to try it, it was free;) and slurp had gone through about 10K pages over the course of two days. How slurp found that one is a complete shocker. I literally only had 2 or three forum sig backlinks on a not-to-popular forum.
Needless to say I will make a fresh post or two there when I get my next project ready to go. If it has the same effect I have a new best friend.
Freq---