1. Digg 2. LinkedIn 3. Twitter 4. Stumbleupon 5. Facebook 6. Propeller 7. Magnolia 8. Jaiku 9. Simpy 10. Technorati 11. coRank 12. YouTube 13. BlogCatalog 14. Zimbio 15. HubPages 16. Reddit 17. UPCHUCKr 18. BlogMad 19. Curbly 20. Flickr 21. PublicBlend 22. Bumpzee 23. Pownce 24. ViewZoo 25. PeekYou 26. Hugg.com 27. Connotea 28. BlinkList 29. BlogFlux 30. Netvous.com 31. Plime 32. MyBlogLog 33. Giggg.com 34. DotNetKicks 35. Diigo 36. CoComment 37. LiveJournal 38. Faves 39. Indianpad 40. Blogmarks.net 41. MySpace 42. Mixx 43. ZiiTrend 44. FriendFeed 45. MetaCafe 46. Last.fm 47. ZippyVideos 48. Quizilla.com 49. Kirtsy 50. Photobucket 51. Deals 52. Agentb 53. BlogSpot 54. HuffingtonPost