Social Networking Sites are popular around the world. Everyday thousands of people are signing up to be a member. This is a great opportunity for business owners to market their business. This Video focuses on Social Marketing tips to help you sell effectively on social networking sites.

This is the comprehensive list of best Social Media and Social Bookmarking sites. I have sorted it by Alexa ranking which roughly represents the popularity of website. All alexa ratings on these sites have sky rocketed, from natural Seo work, but see estimates. All these sites have between 10,000 inlinks to millions of ininks, which help them naturally seo their way to the top of every search engine.

Here is a list of the top 75 social sites.
URL ALEXA Catgeory
1 youtube.com 3 Seo Videos
2 flickr.com 39 Images Online
3 digg.com 127 General
4 metacafe.com 143 Videos
5 stumbleupon.com 380 Cool Content
6 technorati.com 440 Blogging
7 scribd.com 538 Articles
8. blogcatalog.com 784 Internet / Blogs
9. del.icio.us 1,096 General
10. propeller.com 1,140 News
11. twitter.com 1,970 General
12. fark.com 2,028 Entertainment
13. mister-wong.de 2,242 General
14. mybloglog.com 2,252 Blogging
15. indianpad.com 2,577 General
16. kaboodle.com 2,741 Shopping
17. startaid.com 3,026 Internet
18. i-am-bored.com 3,040 Entertainment
19. tutorialized.com 3,214 Tutorials
20. reddit.com 3,851 General
21. slashdot.org 3,856 Tech
22. care2.com 3,898 Social Action
23. blinklist.com 4,229 Internet
24. megite.com 5,227 General
25. balatarin.com 5,368 Persian Digg Site
26. killerstartups.com 5,529 Internet
27. clipmarks.com 5,907 News
28. leenks.com 6,014 Entertainment
29. activerain.com 6,771 Real Estate
30. blinkbits.com 7,354 Internet
31. ulinkx.com 7,453 Videos
32. good-tutorials.com 7,885 Web Design
33. faves.com 7,984 Internet
34. nowpublic.com 8,155 News
35. newsvine.com 8,535 News
36. linuxquestions.org 8,596 Linux
37. stylehive.com 9,600 Fashion
38. pixel2life.com 9,642 Web Design & Development
39. gather.com 10,033 Articles
40. ballhype.com 10,466 Sports
41. shoutwire.com 10,625 General
42. furl.net 10,693 General
43. dealigg.com 13,182 Deals
44. photoshoproadmap.com 14,058 Graphics and Web Design
45. autospies.com 14,858 Cars
46. swik.net 15,202 Open Source news
47. showhype.com 15,914 Web Design
48. mixx.com 20,536 General
49. dzone.com 20,562 Web Design & Development
50. uvouch.com 21,349 Videos
51. sphinn.com 22,136 Internet Marketing
52. clipclip.org 24,325 Internet
53. lipstick.com 24,619 Celebrities
54. searchles.com 25,788 World
55. rojo.com 25,900 General
56. citeulike.org 26,893 Academic
57. buzzflash.com 27,335 News
58. blogmarks.net 27,505 Internet
59. netvouz.com 27,908 Internet
60. rnel.net 30,120 Graphics and Web Design
61. spotplex.com 30,959 Automatic Digg like
62. cgtutorials.com 31,196 Graphics and 3D
63. plime.com 31,893 News Culture
64. Mister-Wong.com 33,172 General
65. wists.com 34,800 Shopping
66. linkroll.com 35,475 General
67. ma.gnolia.com 36,035 Internet
68. simpy.com 37,039 General
69. bumpzee.com 37,897 Internet / Blogs
70. corank.com 38,068 News
71. work.com 38,415 Business & Work
72. teenwag.com 45,916 Teens
73. pslover.com 46,204 Graphics nad Design
74. tailrank.com 46,365 News
75. links.hubspot.com 52,927 Internet