.Trusted site

[Guest]

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[saibose]

Normally .edu and .gov websites classify themselves as trusted websites due to their entity association. Apart from that, there are renowned websites like wikipedia that normally provide unbiased views on topics. They are termed as trusted websites. There maybe inclusions depending on niche, but as a thumb rule, .edu and .gov are the most trusted domains.

[vforvinnie]

I would also say manufacturers would be authority sites.  For instance if you ran a camera site, Nikon, Sony, and other popular manufacturers would be authority links for the camera niche.  Really any creator of an original product will be considered authority.  So any NBA team or other sports franchise homepage would be an authority too.

I would also say any of the top 500 or 1000 sites on the internet (I believe SEOmoz has a 500 list) are close to being authorities.  This won't always hold true but regardless a link from one of those sites will be strong.