There are a lot of search engine optimization (SEO) myths out there that people believe yet are totally bogus when further investigated. Learning which SEO techniques work or don't work can be the key to truly optimizing your website for search engine rankings.
Putting in Too Many Links in One Domain
There's no such thing as having too many links pointing to your site from one domain. People fear reprisal from search engines like Google when this happens because they think that these links may be considered as "spam", which will then cause their sites to get lower search engine results page (SERP) rankings.
The fact of the matter is that regardless of whether the links are site-wide or they're just embedded in another domain's blogroll that's linking to you, this is not an issue at all. Google judges links to your site based on whether or not they're from a manipulative source, not because of the sheer amount of them. You can never have too many links from another site, especially if the webpage is a reputable one.
100,000 Links in One Domain Is Bad for Your Site
If you have 100,000 links pointing back to your site from another site, it's not worth stressing over. You will not be punished for the large amount of links provided on one domain. Google doesn't consider an abundance of links found in a particular source alarming or evidence of spamming or astroturfing unless the source itself is suspicious or the links are from particularly blatant, spam-like pages.
Normally, if there's a good, editorial, or natural reason why you're getting an increase in links, then that's perfectly fine for the search engines and you won't be punished for it. However, just because you have 100,000 links, it doesn't mean that your site is 100,000 times more likely to get a boost in SERP rankings.
Someone is Making Spam Links for Your Site
A couple of links is just as good as a 100,000 links. These extra links won't hurt you unless you bought those links and had them bring you site visibility in a manipulative way. If the latter scenario is true, then you should have those links taken down. If other people are just building spam links to your site without your knowledge, you shouldn't worry about them.
In fact, if your website has gained editorial links from another fantastic site, then you should encourage and foster better relations with such a site. To be true, tremendously valuable content, a great user experience, a well-designed website, and great editorial links will protect you far better from spam links than trying to have them removed from the face of the Internet.
Keyword Density that's Too Dense
It's strange to think that your site's keyword density is too high. There's no such thing as a site with too high a keyword density unless the denseness of the keywords is actually interfering with the quality of your web content in terms of readability and comprehensibility. Keyword density is a good search engine signal, and you should try to make it reach around 2.78% every time.
You don't have to worry about making your keyword density too high if you're writing your content naturally and you're providing a great user experience. Again, satisfying your users is a lot more important than gauging whether or not you have too many keywords in your web content. It also doesn't matter if your keyword density is inconsistent from one page or another. It's literally not a big deal at all.
This blog post has been inspired by SEOMOZ Whiteboard Friday Video.
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