Yes it is possible to use the same social bookmarking list for daily bookmarking of your webpage but one thing which must be kept in mind that you have to use different URLs of your website and with different username as it shows the genuineness for your bookmarking posting.

Don't create spam by posting the same URL with same username daily. It shows that your are promoting your website directly and Google doesn't allow that specially from SEO's perspective.

yes you can but mind the PR of that website

yes you can, if you will promote your new daily bookmarking on single platform it will help you for good traffic also you can get good traffic from there you need to make new friends over there and share your updates with your friends.

whether pinterest work to raise the index of articles on google?

delicious.com
reddit.com
newsvine.com
dzone.com/links/index.html
stumbleupon.com

Very beneficial bookmarking submission for to get more visitor.

Social Bookmarking
 

Yes, you can use add more social bookmarking sites in your current directory. I have searched some new bookmarking sites, i hope you will find it usefull.
plurk.com
stumbleupon.com
reddit.com
youmob.com
these are the popular social bookmarking site's you can use.

thanks to all of u for the reply my question was also the same

reddit is the best very high traffic is there http://www.scoopaper.com/">scoopaper