All are collected by me and should not be copied

This thread could either be in the link building forum or this one, since it is all about social bookmarking, but which sites are the best to get links from. Here is my top list of places to get good, high pr, do follow, quality links from social bookmarking services. (This is out of a list of about 250 such sites, ranked by PR, and how many backlinks they have.)
Site and Rating

1. http://www.Metafilter.com
   PR7
2. http://www.Digg.com
   PR8
3. http://www.IndianPad.com
   PR6
4. http://www.Mixx.com
   PR6
5. http://www.Searchles.com
   PR6
6. http://www.Bringr.com
   PR5
7. http://www.SearchAllInOne.com
   PR6
8. http://www.Propeller.com
   PR7
9. http://www.PlugIM.com
   PR3
10. http://www.BlogMarks.net
    PR4
11. http://www.Kinja.com
    PR6
12. http://www.FeedMarker.com
    PR6
13. http://www.Business-Planet.net
    PR3
14. http://www.ContentPop.com
    PR4
15. http://www.I89.us
    PR0
16. http://www.NewsWeight.com
    PR1
17. http://www.MarkTD.com
    PR3
18. http://www.JumpTags.com
    PR4
19. http://www.Linkatopia.com
    PR5
20. http://www.SocialLogs.com
    PR3