Abstract— The WWW provides an efficient way to store
and share information. Search engines and social
bookmarking systems are important tools for web resource
discovery. This study investigated three different indexing
approaches applied to CiteULike – a social bookmarking
system for tagging academic research papers. The indexing
approaches here are known as: Tag only; Title with Abstract;
and Tag, Title with Abstract. These three indexing
approaches were evaluated using mean values of Normalized
Discount Cumulative Gain (NDCG). The preliminary results
illustrated that indexing using “Tag, Title, with Abstract”
performed the best. The initial evaluation on our
implementation implied that these designs might improve the
accuracy and efficiency of web resource searching on social
bookmarking system, not only in academics but also in other
domains.