25 links from PR5 to PR8 soacial bookmarking sites .High PR (PageRank) Authority sites backlinks . Manual work done with browser only (safe for long term site building) . Popular web 2.0 social bookmark (stumbleupon, delicious, springpad, etc) used. Exposure to targeted Traffic & audience . Approved method to get index & Google SERP (search engine result page) ranking boosting . Google Penguin update friendly & will always safe with future update as bookmarkings were meant for site sharing and submitting.
