1. Reddit: Popular social news website with a large user base. Covers a wide range of news. Includes several topical sections called subreddits, which focus on specific topics like programming, science, politics and business.

2. Digg: The largest and most popular social news website on the internet. Covers all topics including politics, entertainment, technology and general news. Includes a separate video and image section.

3. Propeller: A social news site that covers all topics from technology to politics and entertainment. Operates in a similar fashion to Digg.

5. Slashdot: Primarily a tech news site, Slashdot also covers topics like books, games, politics and entertainment. Users can submit stories and they may be published after editors approve it. A popular site that can send a large amount of traffic.

6. Metafilter: A community weblog which allows users to share links and discuss interesting websites/topics. Moderation is done through editors as well as peer pressure in order to prevent gaming.

7. I am bored: Covers general topics with a strong focus on weird and offbeat news. You can submit a link which may be posted after the editors approve it.

8. Mixx: A general social news sites which has a category for all types of news. Topics covered include business, entertainment, sports, health and tech. Includes the ability to create groups to share news with other users.

9. Shoutwire: General news site that is well populated with a loyal group of users. Topics covered include technology, politics, entertainment, lifestyle and sports.

10. Newsvine: A website consisting of community-driven news stories and opinions. Users have their own blogs and can write articles, save links to external content and vote/comment on other user stories.

11. IndianPad: A general social news site that with a large indian userbase. Topics covered include entertainment, sports, videos and tamil news.

12. Linkfilter: Covers all sorts of news. All links are posted and moderated by users. Links can be ranked on several levels: clicks, votes, age, or a combination of all three called points.

13. NewsCloud: A general social site with a focus on news in all topics. Similar to Newsvine, each user has their own blogs and can publish content to be voted up by other users.

14. Hugg: Hugg is a social news site with a strong focus on environmental issues. Also includes other categories like politics, science, fashion and technology.

15. Plime: A general news site which features a wide variety of topics ranging from religion and sports to technology or business. Odd news performs best in this community.

16. C2NN: An active social news site with a variety of topics including environment issues, business, politics, animals and offbeat. Similar to Hugg in focus but much more populated and active.

17. Kirsty: A general news site with a focus on fashion, entertainment and design on top of other topics like technology and food. Has a strong female user base.

18. Nowpublic: A participatory news network which focuses on citizen journalism. Each user has their own individual profile blog/page and can upload videos, images and news stories.

19. Stirrdup: General social news site with four broad categories: politics, technology, news and entertainment.

20. Searchles: A hybrid social news sites which covers all topics. Includes a video section and offers personalized filtering features and the option of joining groups made up of other users with similar interests.

21. Linkinn: A social news site that specializes in pictures and video. Covers a broad range of topics, particular offbeat and weird content.

22. Earthfrisk: Covers topics like humor, politics, entertainment and business. Combines a social network and group features with digg-style news voting.

23. Truemors: A social rumor news site which focuses on the publication of “true rumors that are relevant, informative, and interesting.” Users can post links anonymously via text, voicemail, web or email. Editors moderate content.

24. StumbleUpon: A social network and browser toolbar which allows users to channel surf the internet. Technically not 100% a social news site, although users can submit webpages to be rated by other users.

25. Linkswarm: Covers a wide range of topics from celebrity gossip to funny media, science and politics. Focuses on pop culture and bizarre news as well.

26. Sphinn: Sphinn is a social site for search and interactive marketers. It’s designed to allow you to share and discover news stories, read and take part in discussions, discover events of interest and network with others.

27. Dzone: DZone is a free link-sharing community for developers. Other topics commonly featured include web design and programming.

28. Tweako: A user-powered site and social network with a focus on guides and tutorials in all categories like computing, technology, and the Internet.

29. Autospies: A social site that focuses on automotive news, car reviews, auto show photos and videos.

30. Design Float: A social news site for design-related content. Topics covered include business, freelancing, advertising, digital art and branding.

31. Ball Hype: A site that aggregates content from thousands of sports blogs. Users can submit stories and votes will determine if they make it to home page.

32. YCombinator Hacker News: A news site that focuses on technology, startups, business and entrepreneurship.

33. SWiK: A community driven resource for people who use open source software.

34. Buzzflash: A user driven progressive political news website that allows you to submit political stories.

35. DNHour: DNHour.com is a user-powered news portal built specially for the domain name industry. Most members are generally from the domain name industry, which includes domain name owners, companies or professionals.

36. PlugIM: PlugIM is a user driven internet marketing community. Topics covered include search engine optimization, products, business and marketing.

37.Showhype: Operates in a similar way to Ballhype. Stories come from two sources — users and aggregated content. Users can also submit a link to a story that they’ve found or write their own article on ShowHype.

38. Small Business Brief: A niche social site which focuses on small business news. Topics covered include marketing and sales, website development, management and entrepreneurship.

39. Hypediss: Social news site with a focus on design, fashion, urban culture and art.

40. Chictini: Product-oriented social site which a focus on new trends and styles. It’s possible to submit news stories although most of the submissions feature products from online retailers.

41. DotNetKicks: DotNetKicks.com is a community based news site that focuses on topics like NET development techniques, technologies and tools including ASP.NET, C#, VB.NET, C++ and Visual Studio.

42. Lipstick: Reddit-style social news site for celebrity gossip.

43. Hubspot: Social news site for marketers, entrepreneurs and business professionals.

44. Winelifetoday: A niche social site for wine lovers. Topics covered included news and opinion articles to do with wine.

45. iliketotallyloveit.com: Allows users to publish and share products with the broader public which they find cool, innovative, exceptionally beautiful, or just weird. Included with every item is a link to an online shop where it can be purchased.

46. Wordsy: A niche social news site for people who love reading and books. Topics covered include small presses, fiction writing, authors, book awards and poetry. (Note: Wordsy has suspended its site since Dec 2008)

47. Value Investing News: A niche social news site that covers stocks and investment news. A small but active community.

48. Teenwag: Focus on celebrity gossip. A hybrid social network with digg-style voting. Users can submit links to be voted up by other users.

49. Muti: Muti is a social bookmarking site inspired by reddit and Digg but dedicated to content of interest to Africans or those interested in Africa.

50. Tip’d: A social media site for finance, investing, and business topics. Tip’d users vote on stories they like by clicking the ‘Tip it’ button that appears next to each story, and then can comment by pressing the ‘Discuss’ link below the story.