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Reddit (stylized in its logo as reddit) is an American social news aggregation, web content rating, and discussion website. Registered members submit content to the site such as links, text posts, and images, which are then voted up or down by other members.

People come to Quora to ask questions about any subject, read high quality knowledge that's personalized and relevant to them, and share their own knowledge with others. Quora is a place to share knowledge and better understand the world.

Stack Exchange is a fast-growing network of 84 [and counting] question and answer sites on diverse topics from software programming to cooking to photography and gaming. We are an expert knowledge exchange: a place where physics researchers can ask each other about quantum...

Hacker News is a social news website that caters to programmers and entrepreneurs, delivering content related to computer science and entrepreneurship.

4chan is a simple image-based bulletin board where anyone can post comments and share images. There are boards dedicated to a variety of topics, from Japanese animation and culture to videogames, music, and photography.

Digg delivers the most interesting and talked-about stories on the Web right now.

News for nerds, stuff that matters. Slashdot (aka /.) is a technology-related news and discussion site with a focus on Linux, free and open source software and information freedom and privacy issues. The software it runs on, called Slashcode, is open source.

Tesse is an expert search engine which allows you to search and connect with global experts by a keyword of skills or expertise.

QueryHome is a Knowledge Social Network for people to come together and ask technical doubts and contribute by answering questions, solving doubts and writing articles.

Hubski is a community for sharing thoughtful information and conversation. Here you can find interesting stories, ideas and events, and share what interests you with others.