What are the most effective social bookmarking sites?

Hello Everyone ...There are so many bookmarking site and i am confuse which site are the most effective in bookmarking. i dont want to waste my time on those site with poor affiliation when it comes to SEO.
Pls Help ME!

Pinterest.com
Reddit.com
Stumbleupon.com
citeulike.org
Delicious.com
 
Hello Everyone ...There are so many bookmarking site and i am confuse which site are the most effective in bookmarking. i dont want to waste my time on those site with poor affiliation when it comes to SEO.
Pls Help ME!

I get a good amount of traffic from Reddit and Stumbleupon. I know there are a lot out there but only those two social bookmarking sites are the ones I've found effective.
 
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