What are some alternatives?
Digg - Digg delivers the most interesting and talked-about stories on the Web right now.
4chan - 4chan is a simple image-based bulletin board where anyone can post comments and share images.
Quora - Quora is a place to gain and share knowledge. It's a platform to ask questions and connect with people who contribute unique insights and quality answers.
Stack Exchange - Stack Exchange is a fast-growing network of 84 [and counting] question and answer sites on diverse...
Raddle - A web-based forum where users submit links, pictures, posts, etc.
Hacker News - Hacker News is a social news website focusing on computer science and entrepreneurship. It is run by Paul Graham's investment fund and startup incubator, Y Combinator.