Anyone trying to find out exactly what is web science might find themselves on a bit of a quest….
As a definitive source and a breadcrumb trail of developments I would turn to publications hosted on the Web Science Trust web site http://webscience.org/
More recently there has been an announcement of a new journal - International Journal of Web Science
Not sure about this new publication - the content seems very web technology and the list of editorial board and reviewers does not seem that close to the web science community emerging through the web science trust.
the way they define their content reveals the space between the two communities as much by what it does not say as by what it claims
IJWS is a refereed scientific international journal. IJWS aims to improve the state-of-the-art of worldwide research in the areas of web theories, services, applications and standards by publishing high-quality papers in this area. IIJWS is committed to deepening the understanding of enabling theories and technologies for applying and developing the web as a global information repository