Social bookmarking Use direct to site, can affect my rank or greatly improves.

Uhh, I think you should improve your Grammar, but I got it what you're saying. Yes, Social Bookmarking can really boost your rank in Search Engines. But the fact is they don't get Indexed fast. So in my opinion you order a Social Bookmarking Service from BST with Drip feed option included. Good luck!

Yes Social Bookmarking will help for ranking but start with High PR do-follow sites and dont blast it and get hit by Google lately.

Thanks