A method for determining the significance of a document, or a portion thereof, is disclosed. Accordingly a search engine, or some other application, analyzes user associated content portions of a document to determine a relevance score for the document (e.g. Curation Rank). The particular algorithm for determining the relevance score will vary depending upon the particular implementation, but may generally be based upon an analysis of the number and quality of user associated content portions, comments, ratings of the user's themselves, and the ratings of users contributing to interactions (e.g. sharing) with the content portions. Based on this analysis, the document is assigned a relevance score which is used for ranking the document in accordance with instructions associated with a search query. E.g. the document relevance score may be used in selecting and ordering documents returned in search results for a particular search query.