NY Times: The Trouble with Curation
RE: Pinterest, Tumblr, etc. : "Web sites like these to escape, destress, perk up, calm down, feel something, not feel something, distract themselves and ... modulate pleasure and arousal." Well-written and spot-on in my experience. Also: "... collecting online is a form of self-expression for people who don’t create." Not everyone who curates can't create but it can be a substitute.