Find below best 20 Social Bookmarking Sites:
http://www.bibsonomy.org/ pr 7
http://www.blogmarks.net/ pr 4
http://www.bmaccess.net/ pr 3
http://www.buddymarks.com/ pr 6
http://www.diigo.com/ pr 7
https://www.chipmark.com/ pr 4
http://www.hyperlinkomatic.com/ pr 4
http://ww2.ikeepbookmarks.com/ pr 4
http://www.lilisto.com/home/ pr 5
http://www.linkroll.com/ pr 2
http://www.reddit.com/ pr 6
http://www.mister-wong.com/ pr 7
http://www.netvouz.com/ pr 6
http://www.nextaris.com/ pr 6
http://tagza.com/ pr 6
http://www.stumbleupon.com/ pr 8
http://unalog.com/ pr 5
http://www.wirefan.com/ pr 6
http://bookmarks.yahoo.com/ pr 7
I will keep updating every month with new social bookmarking sites.