It's really all about curation. Early on, it was yahoo's attempt to put all web content in a big hierarchy. dmoz after that. Then RSS let people curate their

It's really all about curation. Early on, it was yahoo's attempt to put all web content in a big hierarchy. dmoz after that. Then RSS let people curate their own content. Now people subscribe to friends that post interesting things. I don't think the appetite for curation has decreased - it's just that the best method of curation subtly changes as content generation styles change.