From my observations, if you have a few sites, interlinking them isn’t a bad thing. But what about a lot site-wide links between sites?

Getting suddenly hundreds or thousands of links to your site from one site in one go is rarely someone else’s doing. Even when you comment on someones blog and get site-wide links, this is in effect, Your Doing. Your Manipulation. I can see how Google could view this, and I can see how Google could devalue your site. The algo can easily take care of this. Google doesn’t like (some) manipulation.

I’ve heard reports of people’s site’s tanking in all the search engines because of this practice. Some recover - some don’t. Why?

Trust, Relevance, Authority.

If you’re site is trusted, or the site you’re getting the links from is trusted, site-wide links might be a-ok (emphasis on might, I’ve not yet managed to get the W3C to give me a site-wide link yet, but I would surely accept them!). Why? Simply if your site is “trusted” - an authoritative site on the subject - you can get away with a lot more.

I’m a great believer in themes, neighbourhood and relevance (regardless of No-follow) when it comes to getting links. If people are saying Google isn’t good at this yet, you can bet your arse they will be “tomorrow”.

I’m also a believer in Single IP Address + One Link Hitting (well, get a few on strong pages) ;) so sitewide links for me aren’t that attractive anymore.

What’s the benefit of a sitewide link? err…I don’t think there is much, if any. I think a sitewide link could devalue the site they are on and in turn add no real benefit to the site it links to, unless of course there was a strong “theme” to be detected on both sites. Relevant links - well that might be another story altogether.

Note I am talking about site wide links (all identical anchor text). I’ve done a bit of experimenting with sitewide links with different anchor text, and the results I have to say weren’t bad. I’ve also experimented with links on 90% of the pages ;)
I think sitewide links aren’t as good as links that feature on a % of the pages, or indeed links that are on the strongest pages of a site. Sitewide links also kind of have the same kind of footprint as “paid for” links, which Google likes as much as I like the painters in round at my girlfriends ;)
In the end, you must ask “does Google think I am manipulating things?“. Are you signalling to Google what you want to rank for when, in short, your site doesn’t have enough authority or trust to rank in the top 10 for that keyword yet? Cheek! ;)
Sitewide links = visible manipulation, the only exception being, I think, two trusted sites in the mix, in the same neighbourhood, compelled to link to each other in this way.

On a final note it’s worth remembering if sitewide links are easy for Google to isolate and identify, they are easy to turn off or on when Google factors your site in it’s serps. Sometimes you’ll be up, sometimes you’ll be down, sometimes you’ll be out.

Do you really want your online marketing efforts so easily susceptible to such fleeting and easy to change nuances? I didn’t think so…..

So say no to site-wide links, unless they are from the W3C ;)

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