High PR Top 10 Dofollow Social Bookmarking sites

[Clones]

Here i found good list of do follow social bookmarking sites


http://slashdot.org/
http://technorati.com/
http://www.mixx.com/
http://www.folkd.com/
http://www.wikio.com/
http://buddymarks.com/
http://marketingland.com/
http://www.mylinkvault.com
http://sourceforge.net/
http://linkagogo.com/

Any thanks will be really very appreciated
If possible