The Pakistan Telecommunication Authority (PTA) has blocked Facebook over a competition encouraging its users to post caricatures of Prophet Mohammad (PBUH) on the social networking site.

Earlier in the day, the LHC ordered authorities to block Facebook until May 31..

The depiction of any prophet is strictly prohibited in Islam as blasphemous and Muslims across the world staged angry protests over the publication of satirical cartoons of the Prophet Mohammed in European newspapers in 2006.

Soical Book Marking is the best way to get targeted visitors for your website but most of the biggener webmaster even dont't know what is social book marking. Today , I will explain the answers of some frequently asked question about social book marking.

1) What is social bookmarking?

[A] Social bookmarking is a user-based online system in which individuals tag their favorite web content and store it in one place, sharing it with others. The favourite content of person may also favourite of another person then it will boost your website traffic.

2) When did social bookmarking start?

[A] Social bookmakring began in crude form in the late 1990’s. It then fell out of favor online due to changes in the web. It came back in 2005 and has been getting increasingly popular ever since.

Nowadays, the websites like digg, twitter,facebook etc.. are the most popluar websites of the world.

3) What are the best social bookmarking sites?

[A] That depends on the content that you have, the tone that you use and the way that you network on the sites. Some of the most popular sites include Digg, del.icio.us, Furl, and Stumble Upon but many other sites are popular as well. Flickr is a site currently popular for social bookmarking of images. Check out the full list.

4) How do social bookmarking tags work?

[A] Users can tag their favorite sites with different keywords which help them to organize the content. So they might have “music” as one category for all sites that are related to that. In recent years, tags have gotten more involved because they are used to help others find your content and to help search engines see your content. Choosing the right tags can help drive content to your site.

5) Can anyone do social bookmarking?

[A] Yes, but you need to spend some time to learn how to do it right if you’re doing it for business purposes. There is etiquette on the social bookmarking sites that you can only pick up on by spending time there and seeing how people interact and promote content.

6) Is social bookmarking just a fad?

[A] Social bookmarking is a new trend. In its current form, it may be a fad and we may see that many of the new sites that are cropping up only last a short time. But the general idea of what social bookmarking is – the trend of user-driven content that spreads the word about products and supports business – is probably here to stay.

7) Is social bookmarking really necessary or my business?

[A] If your business operates locally in a small area and you don’t want to grow out of that area, then you may not need social bookmarking. But for national businesses that operate primarily on the web, social bookmarking is a key tool. It drives traffic to your website, increases attention to your services and products and helps spread the word about your business. It puts you higher on search engines and lets people know that you’re there to meet their needs. And it’s what consumers want right now; so give it to them!

How do I get started with social bookmarking?

[A] Learning about it is the first step. Read blogs, articles and books about the topic. Then start playing around on the sites. See which ones you like, which ones make sense to you, which ones are popular among the readers of your site and then develop your own method of using social bookmarking tools to work for you.

List of Social Bookmarking Sites with Google PageRank & Indexed Pages 

Sites with PR5 and Above

Quick, name an online bookmark service. What comes to mind? Digg? Del.icio.us? StumbleUpon? Mixx?These are some of the most commonly used services, but they're not alone. There are hundreds of places that let you save your bookmarks online.

This list names 100 social bookmarking sites and includes the PageRank for the site's homepage, as well as the number of pages indexed in Google.

NOTE: The PageRank and indexed links information comes from the SEO Quake add-on for Firefox and was pulled in January 2008. Please note that PR and indexed pages are subject to change. To check today's data, download the Google toolbar, SEO Quake add-on or another tool.

1. Slashdot – PR9 – 188,000 links
2. Digg – PR8 – 3,470,000 links
3. del.icio.us – PR8 – 1,540,000 links
4. Reddit – PR8 – 1,040,000 links
5. Technorati – PR8 – 760,000 links
6. Stumbleupon – PR8 – 725,000 links
7. Blinklist – PR7 – 1,620,000 links
8. Furl – PR7 – 1,210,000 links
9. Propeller – PR7 – 322,000 links
10. Rojo – PR7 – 6060 links
11. de.lirio.us – PR7 – 3770 links
12. Folkd – PR7 – 410 links
13. Netvouz – PR6 – 912,000
14. Mister-Wong – PR6 – 898,000 links
15. Simpy – PR6 – 867,000 links
16. Bibsonomy – PR6 – 469,000 links
17. Kinja – PR6 – 438,000 links
18. Backflip – PR6 – 227,000 links
19. Clipmarks – PR6 – 121,000 links
20. Rawsugar – PR6 – 50,300 links
21. Searchles – PR6 – 32,000 links
22. Searchallinone – PR6 – 18,800 links
23. Tailrank – PR6 – 10,900 links
24. Linkagogo – PR6 – 6790 links
25. Web2List – PR6 – 4780 links
26. Spurl – PR6 – 38 links
27. Faves – PR5 – 1,280,000 links
28. Megite – PR5 – 753,000 links
29. Clipclip – PR5 – 323,000 links
30. StartAid – PR5 – 637,000
31. Linkroll – PR5 – 147,000 links
32. Sk*rt – PR5 – 104,000 links
33. Listible – PR5 – 60,400 links
34. Feedmarker – PR5 – 58,800 links
35. Markaboo – PR5 – 48,400 links
36. Bringr – PR5 – 16,500 links
37. Gabbr – PR5 – 5000 links
38. Mybookmarks – PR5 – 916 links
39. Buddymarks – PR5 – 907 links
40. Tallstreet – PR5 – 408 links
41. Mylinkvault – PR5 – 71 links

Social bookmark sites with PR4 or Below

42. Ma.gnolia – PR4 – 818,000 links
43. Web2Announcer – PR4 – 305,000 links
44. Diigo – PR4 – 276,000 links
45. Plugim – PR4 – 120,000 links
46. Lifelogger – PR4 – 86,700 links
47. Dropjack – PR4 – 65,000 links
48. Indiasphere.Net – PR4 – 45,900 links
49. Otavo – PR4 – 35,000 links
50. Butterflyproject.nl – PR4 – 34,500 links
51. Lookmarks – PR4 – 32,700 links
52. Myvmarks – PR4 – 28,200 links
53. Blurpalicious – PR4 – 25,300 links
54. Cloudytags – PR4 – 24,100 links
55. Mysitevote – PR4 – 20,000 links
56. A1-Webmarks – PR4 – 15,200 links
57. Philoi – PR4 – 12,400 links
58. Oyax – PR4 – 12,000 links
59. Gravee – PR4 – 9940 links
60. Votelists – PR4 – 6150 links
61. Gd-Sites – PR4 – 5840 links
62. Contentpop – PR4 – 5490 links
63. Gaddiposh – PR4 – 3130 links
64. Urlex.Info – PR4 – 654 links
65. Connectedy – PR4 – 636 links
66. Connectedy – PR4 – 568 links
67. Unalog – PR4 – 162 links
68. Bookmarktracker – PR5 – 314 links
69. Marktd – PR3 – 130,000 links
70. Getboo – PR3 – 96,500 links
71. Listerlister – PR3 – 19,100 links
72. Bookmarkplace – PR3 – 15,100 links
73. Jigg.In – PR3 – 9220 links
74. Stirrdup – PR3 – 9220 links
75. Chaamp – PR3 – 7770 links
76. Ez4U – PR3 – 6520 links
77. Socialogs – PR3 – 5200 links
78. Business-Planet – PR3 – 4740 links
79. Articlesnetwork – PR3 – 3670 links
80. Wirefan – PR3 – 3030 links
81. Fritterware – PR3 – 2970 links
82. Sitesays – PR3 – 1560 links
83. Bookmark4You – PR3 – 948 links
84. Crowdfound – PR3 – 782 links
85. Authorcontent – PR3 – 513 links
86. Info4It – PR2 – 91,100 links
87. Palbe – PR2 – 9300 links
88. Dealoid – PR2 – 9270 links
89. Barksbookmarks – PR2 – 7370 links
90. Articlesarchieve – PR2 – 5350 links
91. Article-Publishers – PR2 – 4380 links
92. Latestramblings – PR2 – 3180 links
93. Xlmark – PR2 – 2120 links
94. Ebizgo.Info – PR2 – 1150 links
95. Actualtopics – PR2 – 749 links
96. Projecthear – PR1 – 19,600 links
97. Wordsjournal – PR1 – 14,100 links