D-Lib Magazine April 2005 Volume 11 Number 4 ISSN 1082-9873 Social Bookmarking Tools (II) A Case Study - Connotea Ben Lund†, Tony Hammond†, Martin Flack ‡ and Timo Hannay† †Nature Publishing Group {b.lund, t.hammond, t.hannay} @nature.com ‡NeoReality,Inc. martin@neoreality.com Introduction Connotea [1] is a free online reference management and social bookmarking service for scientists created by N