Mediamatters - Mediamatters or Media Matters for America (MMFA) is a nonprofit website with state mission of comprehensively monitoring, analyzing and correcting conversation misinformation in U.

Hubski - Hubski is a community for sharing thoughtful information and conversation.

Zimbio - Zimbio.

Snapzu - Snapzu is basically reddit alternative.

Tumblr - A feature rich and free blog hosting platform offering professional and fully customizable templates, bookmarklets, photos, mobile apps, and social network integration.

Stack Exchange - Stack Exchange is a fast-growing network of 84 [and counting] question and answer sites on diverse...