What about the social networking forums like Ning and Collective X?

FORBES: There's More to Social Media than Twitter, Facebook and LinkedIn

Among the "Social Networking and Forums" category, however, Twitter came in at 23rd for the week ending 17 January, garnering just 0.24% of the site visits in the category.

BBC: Tweet smell of success over Digg

If step one was building the content machine, the Greatist founder believes step two lies in social networking, specifically the forums that launch Wednesday along with a site redesign.

FORBES: Greatist: Or How Social Networks Are The Answer To America's Obesity Epidemic