Selected General and Niche Social Web Sites

Newsvine
“Seattle-based Newsvine, Inc. was launched in March 2006 by a small team of like-minded colleagues with one purpose: to build a perfectly different, perfectly efficient way to read, write, and interact with the news.”

Propeller
“Propeller is a social news portal, meaning that it is programmed by you — the audience. Its members post links to stories from all over the Web. Many of these stories originate from the websites of traditional media, including newspapers and magazines. But you will also find many stories that seldom pop up in the mainstream.”

Slashdot
“Slashdot is the ‘Daily Planet’ for the technology community. We provide our readers with a ritualistic daily dose of technology news, culture and humor.“

Metafilter
“Metafilter is a Weblog that anyone can contribute a link or a comment to. It seeks to break down barriers between people and foster discussion among its members.”

Mixx
“Mixx Channels give publishers an easy way to cut through the swirl of social media and create an engaging experience with their brand and design.”

Treehugger
“TreeHugger is the leading media outlet dedicated to driving sustainability mainstream. Partial to a modern aesthetic, we strive to be a one-stop shop for green news, solutions, and product information.”

Care2
“Care2 provides powerful tools to make a difference in your life, your community, and the world. Our website is driven by passionate people (like you) who want to restore the world's balance. We pride ourselves on being a different kind of company. As a certified Benefit Corporation (B-corp), we’re committed to using the power of business to make a positive social and earth-friendly impact on the world.”

Source: Staff selections and doshdosh.com -- "Dosh Dosh is a blog offering internet marketing and blogging tips, alongside social media strategies. Best consumed by bloggers, entrepreneurs, web publishers, marketers, freelancers and small business owners."