Curated content can be useful and efficient for a readers time if they want to visit a site with a particular content. It allows a site to focus on a core relevancy and limits the hivemind effect. IMO there is value in both curated and community driven sites. The key is either site is upfront about what they expect to offer.
This isn't limited to community driven sites and has existed long before the word "social" had anything to do with computers. It used to be if you posted controversial things to your website, you had to contend with the company you bought your hosting from.
Facebook and Twitter make it easier, but this is nothing new and has nothing to do with curation.
