i have build few tier1 web 2.0 backlinks..now how can i build tier 2-3 backlinks?? i dont want to use automation tools...i am planning to do forum profiles and auto approved article website..is pr important in tier 2 link building?? i am also planning to do social bookmarking of tier 1 backlinks...how to do social bookmarking efficient?? i mean how many bookmarks i should do per day??