The most helpful aspect is the integration of social networking in this citation management software compared to other similar softwares.

Author names, title, et.al. are imported automatically. One can even manually add tags for grouping of various references together. It can be used to search references made by all or one user. it encourages discovery of new articles.

CiteULike has a lot of information on articles, and it is different from other databases in that it also has groups and shares information on users who are also interested in the topic.