Well, first of all my website is big, having over 250 articles and is a wide niche. (let's say fitness for example). My SEO is not so aggresive till now having mostly blog coments, Web 2.0's and some PBN links pointing to subpages. I am thinking to start using WEB 2.0's for each article I want to rank as Tier 1 links. My question is: If some WEB 2.0's are from the same domain like wordpress.com pointing to differend subpages each time, is that an issue? How many WEB 2.0's from each domain would you suggest to use? I find it hard to SEO a bigger website that focuses on articles rather than the homepage.. because of issues like that.