Too More Links in Message Allowed 0 Links Reduce Number of Links and Post It Again
There's a long-standing debate in SEO about the maximum number of links that you should place on whatsoever given page. If you use the SEOmoz PRO Campaign Manager, you lot may have seen a warning that looks something like this:
Digging deeper into the "Too Many On-Page Links" warning, yous'll see the message:
You lot should avoid having too many (roughly defined as more than than 100) hyperlinks on whatsoever given page.
A number of people take asked where we came up with 100 as the magic number and whether this is a hard limit or but a suggestion. I'm going to talk a flake virtually the history, whether that history still applies, and what the potential consequences are of breaking the 100-link barrier.
Where Did We Get 100?
The 100-link limit actually came from sources within Google and has been restated for years, as recently as a March 2009 post by Matt Cutts, in which he quotes the Google guidelines equally maxim:
Keep the links on a given page to a reasonable number (fewer than 100).
The early crawlers capped the amount of data they would process for any given page, due to bandwidth limitations. Ultimately, 100 links was mostly a good rule of thumb for what would fit in a page that met those processing limits.
Could You Be Penalized?
Earlier we dig in also deep, I want to make information technology clear that the 100-link limit has never been a penalisation situation. In an August 2007 interview, Rand quotes Matt Cutts every bit saying:
The "keep the number of links to under 100" is in the technical guideline department, not the quality guidelines section. That means nosotros're not going to remove a folio if yous take 101 or 102 links on the page. Recollect of this more equally a dominion of pollex.
At the time, information technology's likely that Google started ignoring links after a sure indicate, just at worst this kept those post-100 links from passing PageRank. The folio itself wasn't going to exist de-indexed or penalized.
Is 100 Nevertheless The Limit?
Since Matt's 2009 comment, the Google guidelines folio he quotes seems to have dropped the phrase "fewer than 100." Observations from across the SEO community and multiple Google Webmaster Help threads confirm this change. In April 2010, Google engineer John Mu endorsed the following answer:
100 links to a folio is a simply a suggestion … There are pages out there with more than than 100 links, and it isn't an issue. If your page is sufficiently authoritative, Google is going to be interested in the pages that are being recommended by that page.
Like many Google "limits," this is probably non a concrete number, and nearly likely varies with site authority. It's also probable that the number has increased over time, as Google overcomes processing limitations (particularly mail-Caffeine).
Then, Does It Notwithstanding Matter?
The short reply is "aye." At that place's an inescapable reality in SEO that the more links a folio has, the less internal PageRank each of those links passes. To quote Matt again from his interview with Rand:
At any rate, you're dividing the PageRank of that page betwixt hundreds of links, so each link is only going to pass along a minuscule amount of PageRank anyhow.
To put it just, more links equals less PR for each link. The bodily math of internal PageRank menstruation gets complicated fast, simply permit'due south look at a couple of very simple examples.
Example i: 3 Level-2 Pages
Let's say nosotros have a very basic site with a domicile-page and three second-tier pages linked from it. I'm going to grossly oversimplify the PR model, only let'southward say those 3 pages each inherit i/3 of the PR of the domicile-page. Let's too presume that Google doesn't allow a page to pass 100% of its own PR – nosotros'll cap the amount at 85% of the original folio'south PR (we're talking most actual PR in this instance, not Toolbar PR). The issue would look something similar this:
Here, each of the pages inherits roughly 28% (0.85/3) of the original PR of the abode-page. Over again, I'm oversimplifying a much more complex reality to make a signal.
Case 2: 150 Level-2 Pages
At present, let'due south aggrandize those 2d-tier pages and say that the home-page links to 150 internal pages. The diagram and PR values would look something like this:
Divide 150 ways, the original 85% of the PR the home-page can pass ends up existence less than 0.half dozen% (0.85/150) per page. My graphic may have gotten a trivial carried away, merely it's easy to see how chop-chop internal PR tin become diluted in these situations.
What'south The Right Number?
As with then many complex SEO issues (and I'one thousand considering this purely from an SEO standpoint), there'south no 1 answer. In that location'south a balance between building a site structure that'south likewise deep, creating pages that are many links removed from loftier-authority pages, and one that's too "flat," creating a situation like the one in a higher place. While many SEOs argue in favor of flat architecture, the basic problem is that it treats every link equally existence equal. Do yous really have 150 (or more) pages that all deserve equal treatment from the home-page and that should all carry equal PR? Probably not, and so we try to take a counterbalanced, hierarchical arroyo, focusing internal PR on the most important pages get-go. Ultimately, while it may exist outdated, the 100-link guideline is nonetheless probably a decent rule of thumb for near sites.
Source: https://moz.com/blog/how-many-links-is-too-many
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