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So
1) Has "authority" site just become another euphamism for being ranked number 1/2
2) Does "authority" mean that there has been a perceived change (although not that recent I realise) in the Google algo to give even more credibility (i.e. ability to infer credibility) to these sites
or
3) Is it referring to the "fact?" that there are additional filters applied to sites at this level, and to survive the filters, you must be an authority?
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