Pearltrees (http://www.pearltrees.com) offers an attractive way of mapping sites and creating links between sites that you use.  A “pearl” is a web site that you have discovered and found to be useful; a “pearltree” is a collection of such sites.  Having created a “pearltree”, it can be shared with others, thus providing a quick and convenient way of conveying the results of a search.  It is simple to use: the main benefits become available by registering and opening a free account.  Phil Bradley, an Internet consultant who writes a monthly column for Library and information update (the official journal of the Chartered Institute of Library and Information Professionals <http://www.cilip.org.uk/update>), has created a web tutorial illustrating the use of Pearltrees — < http://bit.ly/cL6Wjh >. In it, he shows how to set up an account, build and share a “pearltree”.  This approach to sharing of web resources is typical of a social networking approach to information use and one that has great potential benefits for all types of library and information service.