Thats why i tried to post my experience here what i got in terms of Social bookmarking.Given below are some points given to keep in my mind what you should look for in social bookmarking:-
1. You should select the authority sites for Bookmarking like digg,delicious,stumbleupon,reddit etc. Because for indexing the quality matters not the quantity.If you will bookmark your webpage to 100 of sites on first day.It will be clearly a spam in Google's view.
2. You should take care of Tags as it is very important part of the Bookmark .And you should give your keyword as a tag.
3. Description should not be more it should be short and very clear about your services and products.
Hey friends this is what I feel is very important in Bookmarking for a new webpage or any webpage if i am wrong please correct me .All your suggestions are welcome.