Big news in the world of participatory journalism, with MSNBC buying Newsvine for an undisclosed sum. Newsvine continues to operate as a separate site, while MSNBC looks at ways of incorporating its social and community features. Newsvine CEO Mike Davidson explains the deal on his personal blog: So why would an independent, cost-efficient, growing startup like Newsvine which has taken very little venture capital want to join a huge organization