Lets talk seriously now. What's the big difference? They all provide the same.. Article directories: Your own article / related to your niche. High PR. High DA/PA. Web2.0: Your own articles / related to your niche. High PR High DA/PA PBN: Your own articles/ related to your niche. High PR High DA/PA Now what I'm saying is... What's the difference? I mean I know there are differences but why are some so much more valuable than others if those 3 have pretty much the same value in theory?