Web 2.0 links are powerful as these are high PR websites. Blogspot.com has a PR of 9. I created a blog there and checked the PR again and it came back with N/A. This is my confusion. How do we get link juice of a PR 9 site then? Can somebody please explain? Do the articles we post on these web 2.0s for link building need to be unique and readable? Or spun articles are fine?