Whether you’re on a first date, meeting new people at a dinner party, or making it rain on Twitter, it’s just not a good idea to go on and on about yourself. It’s just awkward.
If you read this topic, you probably agree with that starting quote. What's interesting in this post by Argyle Social on Convince & Convert is that it's one of the first quantified analysis I saw that proves the point by measuring out both the click through rate on sharing and the conversion rate thereafter.
Neither curation nor creation wins but a mix of both. As what some of us intuitively thought (http://www.scoop.it/t/web-content-digital-curation/p/235898447/curation-and-creation-social-media-s-dynamic-duo or Jeff Jarvis when he says "Cover what you do best / Link to the rest", as a new rule in journalism).
To go further on this, I'd love to isolate the case that happens when your curation is on your site. This is typically something we believe in at Scoop.it and that led us to release the "Scoop.it everywhere" features (http://blog.scoop.it/en/2011/05/04/scoop-it-be-heard-everywhere/), enabling you to mix curation and creation by sharing to blog platforms such as Tumblr or Wordpress. And also adding more context than what you would in a short tweet, highlighting content, enriching it or showing related content.
We'll see if maybe we can find out a way to do that type of analysis at some point and see whether it's the ultimate sweet spot.