I had wanted to put together a list of social media communities for a while now, but I couldn’t think of a good way to organize them. So I got to thinking about what helps me decide if it’s worth it to participate in a social community. Most of the time when I am looking for a community I want to find one that will help build links for a website I’m working on. Therefore I decided to list the communities by their inbound link counts as determined by Yahoo. Enjoy the list below of the top 70 social media communities, and feel free to email me if you know of a community not featured on this list.

1. Del.icio.us - 34,500,000

2. StumbleUpon - 15,900,000

3. Digg - 14,500,000

4. Reddit - 11,600,000

5. SlashDot - 10,200,000

6. Simply - 5,940,000

7. Propeller - 5,090,000

8. NewsVine - 4,460,000

9. Multiply - 2,950,000

10. Fark - 2,910,000

11. LipStick - 2,660,000

12. MetaFilter - 1,980,000

13. Care2 - 1,980,000

14. Kaboodle - 1,810,000

15. BallHype - 1,300,000

16. I Am Bored - 1,060,000

17. Meneame - 722,000

18. Plime - 588,000

19. BibSonomy - 549,000

20. NowPublic - 501,000

21. Kinja - 497,000

22. Searchles - 483,000

23. Dzone - 429,000

24. IndianPad - 409,000

25. ShowHype - 371,000

26. Sk*rt - 249,000

27. Mixx - 243,000

28. ShoutWire - 227,000

29. Faves - 211,000

30. LinkFilter - 198,000

31. BuzzFlash - 161,000

32. CoRank - 130,000

33. SmallBusinessBrief - 120,000

34. myVmarks - 101,000

35. Listible - 96,600

36. Sphinn - 92,700

37. LinkInn - 80,300

38. AutoSpies - 69,990

39. BmAccess - 34,800

40. HypeDiss - 33,300

41.Truemors - 28,000

42. Hugg - 26,000

43. WineLifeToday - 25,000

44. I Like Totally Love It - 21,400

45. Value Interesting News - 20,000

46. LinkAGoGo - 19,600

47. TeenWag - 17,700

48. JumpTags - 17,600

49. PlugIM - 14,000

50. Zlitt - 12,400

51. DotNetKicks - 12,000

52. A1 Webmarks - 11,700

53. memFrag - 10,300

54. DNhour - 9,810

55. Multi - 8,650

56. Tweako - 8,380

57. SyncOne - 5,440

58. WireFan - 4,850

59. MyLinkVault - 4,760

60. NewsCloud - 2,820

61. Wordsy - 2,670

62. MyPickList - 2,380

63. Connectedy - 2,370

64. HubSpot - 1,940

65. SpotBack - 681

66. Yattle - 305

67. NewsWeight - 200

68. EarthFrisks - 169

69. TeDigo - 143

70. SocialLogs - 114