Free Social Bookmarking Sites list of PR above 4

Sites	Page Rank
https://www.google.com/bookmarks/	9
https://delicious.com/	8
https://www.diigo.com	7
http://www.newsvine.com/	7
http://www.folkd.com	6
http://www.bizsugar.com/	6
http://blinklist.com	6
http://www.dropjack.com/	5
http://www.grjm.net/	5
http://fwisp.com	5
http://www.superuse.org/	5
http://zootool.com	5