document: The value of socially tagged urls for a search engine Social bookmarking has emerged as a growing source of human generated content on the web . In essence , bookmarking involves URLs and tags on them . In this paper , we perform a large scale study of the usefulness of bookmarked URLs from the top social bookmarking site Delicious . Instead of focusing on the dimension of tags , which has been covered in the previous work , we explore social bookmarking from the dimension of URLs . More specifically , we investigate the Delicious URLs and their content to quantify their value to a search engine . For their value in leading to good content , we show that the Delicious URLs have higher quality content and more external outlinks . For their value in satisfying users , we show that the Delicious URLs have more clicked URLs as well as get more clicks . We suggest that based on their value , the Delicious URLs should be used as another source of seed URLs for crawlers .
doc_bio_tags: O O O O O O O O O O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O B O O O O O O O O O O O O O O O O O O O O O B I O O O O O O O O O O O O B O O O O O O O O O O O O O O O O O O O O O O O O O O B O O O O O O O O O O O O O O O O O O O O O B O O O O O O O O O O O O O O O O O O O O O B O O O O O O O O O O O O O