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I've got a site that has dropped significantly for some search terms on SJ, and the only thing I can think of is that my site is no longer "themed" like others still ranking well. Because of the people linking to my site. So when you do a "similar sites" search on google for my site, you see all these shadey sites as well.
So Google obviously thinks I'm somehow related/similar to these sites.
I hope GoogleGuy can shed some light on this because it would be really unfortunate if poeple could change the "theme" of your site by linking a bunch of off-theme spam to it.
For ex. there are 10 links to your site and the link text is ten times abcd
Then in terms of links you have a relevancy of 100 % to the keyword abcd.
However if 5 links say abcd and 5 say xyz then you would have a relevancy of 50 % to the keyword.
Acording to this rule you would'nt rank that high on either of the keywords.
This won't matter for sites with thouthands of links, but it can harm smaler sites.
I have had a domain where this has happened.
But I don't know if Google has changed their algo meanwhile on that
I finally figured out what happened, and it's sort of related to the expired domain game.
One of our members had a URL third level domain with one of the redirection services (name.service.com) that went to his account at his ISP (www.isp.com/~name). He recently set up www.name.com, and got most of the links changed over.
He no longer needed the redirection service so he closed that account and in less than a day a danish porn site swooped in and picked up his account name
The porn site was showing up as a backlinke because his site used to have a link to my site, but the porn site was in the cache and the backlinks from a more recent crawl.
For the general search, I've never seen evidence Google themes between sites. (Although, they may theme based on all the content on a specific site.) If Google did, then this would be a way to hose the competition. Who links to a site is out of the Webmaster's control.
I have read here in the past that google's algo cannot punnish a website for anything someone else does, including any spammy ways someone links to it.
I guess my question is, can the fact that a competitor is using hidden anchor text links on every page of their website have an adverse effect on my clients PR or anchor text and backlinks calculation?
The other strange thing is that over 100 legitimate backlinks are not showing up on any of the semi-updated datacenters, yet this hidden spam does....
Or tell him that you will file a spam report on him.
As he is using such tricks he is probably spaming as well.
If I would be him I would delite the link then :-)
Exactly, that's why Google's new "local pagerank" patent and "spam maps" (whatever it is)... really scares me.
I'm thinking they are somehow interpreting sites that exhibit unusual linkage structure as being spammy, or not assigning it any local pagerank of it's local industry theme. Which is fine if analyzing outbound links, but not really fair for inbound links for the reason you mentioned.
At best this would be a waste of time, and at worst you just boost this other site's PR and SERPs. Why do him a favor? Only possible downside of links like this is wasted bandwidth if visitors who would have no interest in your site click on the link.
I'd be more concerned about the link text itself. There was a lot of snickering a while back when it was realised that where a porn splash page asked 'are you over 18?' - it let you into the site if you clicked 'yes, I am over 18' - and if you clicked 'No, I am under 18' - you got redirected to a 'kids' type site.
I just checked - disney still ranks number 1 for 'i am under 18' - which isn't a phrase on the page. Which isn't necessarily bad in this example.
But it could be.