Link Diversity, is that really important?

[Autofresh.in]

supaul is suggesting to make some tier 2 links from web2.0. 
Do you know about tier 1, tier 2, tier 3 links?

Not necessarily they always have to be web 2.0 sites.

They can be links from article directory sites, or links from sites like medium or huffingtonpost.

The kind of links that have no whatsoever effect in competitive niche but can impact positively in a low competitive or to some extent medium competitive niche.

I hope you get it.

Got it mate  

And yes, tier 2 links can be from any of off-page activity not just web2.0.