This article highlights the analytics you need to focus on when you run a content curation site. As the author points out, you are sending people off-site when they read your content, so you need to look at statistics of who comes back and how often. These are available in Google Analytics, but they are buried.
However, content curation is unique among content marketing strategies because it relies on third-party off-site content. As a result, audience behaviour is very different from traditional online marketing campaigns where all content is consumed within a brand’s online properties.