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You Don’t Need Link Volume, You Need Link Quality
Indexing Tier Impacts Link Value
A metric called sourceType that shows a loose
relationship between the where a page is indexed
and how valuable it is. For quick background,
Google’s index is stratified into tiers where the
most important, regularly updated, and accessed
content is stored in flash memory. Less important
content is stored on solid state drives, and
irregularly updated content is stored on standard
hard drives.
The higher the tier, the more valuable the link.
Pages that are considered “fresh” are also
considered high quality. Suffice it to say, you want
your links to come from pages that either fresh or
are otherwise featured in the top tier.