“This paper reviews some current initiatives, as of early 2005, in providing public link management applications on the Web – utilities that are often referred to under the general moniker of ‘social bookmarking tools’. There are a couple of things going on here: 1) server-side software aimed specifically at managing links with, crucially, a strong, social networking flavour, and 2) an unabashedly open and unstructured approach to tagging, or user classification, of those links.” (Tony Hammond et al. – D-Lib Magazine April 2005)