Tier1+unique articles

enc0re

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This might be stupid question but I didnt found good answer to that question.
When I build tier1 backlinks, should all content be unique?

Like, I have 10 web 2.0 properties, should I have 10 unique articles or is it good to use just one?

And second question, what is enough unique, 90%? (Tier1 backlinking)

Sry my english, hope you understand it :D
 
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