Hello, I know it's a very difficult question to answer because it varies the relevance, pagerank and other factors over the domain. But I wonder, what is the value of backlinks from the same domain. Sample: site A: 20 backlinks from different domains site B: 10 backlinks from different domains and 50 backlinks for each domain Let's pretend that all domains have equal relevance. Which site would be best?
-- 20 links vs. 500 links -- Assuming all link placements are unique and content is related to your site, Site B. Quantity with quality.
It really only matters on the content surrounding those pages value. If I can get 30 links back of different content on a established domain, it weighs heavier that 2 link backs from 2 domains. However, if those 2 domain links were on high traffic home pages, I may beg to differ.
It will depend on the PR of each page and relevance to your niche. Without that, we can't really say which one is better.
Yes, I understand. I've read in many places in the same domain that links are worth less than the different domains (assuming that the pagerank, relevance of the page ... are equal). My competitor has 800 backlinks from 10 different domains
I think A is better,Google does not credit very much sitewide links.I haven't experienced, but i have read about it.
Simplified: Site-wide links will help you, so take advantage of them. Get as many links as you can from different domains, they will help you.
If you meant to say: Site A: 20 backlinks - 1 from each of 20 different domains Site B: 500 backlinks - 50 from each of 10 different domains Then assuming all URLs where the links exist (NOT domains) have equal relevance, PR, etc. then Site B would win as used_cisco said. Google just got an interesting little patent approved last month that they applied for 6 years ago in 2004 which allows them to detect (and likely discount/devalue) sitewides, blogrolls, link farms, link wheels, etc. But there is no way you're going to come up with any kind of formula to determine if sitewides from X domains are better or worse than Y single links from Z domains... just too many factors. Fact of the matter is... you should have lots of both. You should have a diverse backlink profile that includes not only one-way contextual links but also site-wide/blogroll types links just as you should have a certain (allbeit small) percentage of nofollow links. The more diverse your back link profile, the more natural it will look and the less vulnerable your back link profile will be to changes in the ranking algorithms at various search engines.