CommunityEngine is a free, open-source social network plugin for Ruby on Rails applications. Drop it into your new or existing application, and you’ll instantly have all the features of a basic community site.
"The bottom line is that Chinese mercantilism is a growing problem, and the victims of that mercantilism have little to lose from a trade confrontation. So I’d urge China’s government to reconsider its stubbornness. Otherwise, the very mild protectionism it’s currently complaining about will be the start of something much bigger."