Thisyear'svolumeofAdvancesinWebMiningandWebUsageAnalysiscontains
thepostworkshopproceedingsofajointevent the9thInternationalWorkshopon Knowledge Discovery from
the Web (WEBKDD 2007) and the First SNA-KDD Workshop on Social Network Analysis (SNA-KDD 2007).
The joint workshop on Web Mining and Social Network Analysis took place at the ACM SIGKDD
International Conference on Knowledge Discovery and Data Mining (KDD). It attracted 23
submissions of which 14 were accepted for presentation at the workshop. Eight of them have
been extended for inclusion in this volume. WEBKDD is one of the most traditional workshops of
the ACM SIGKDD internationalconference under the auspices of which it has been organizedsince
1999. The strong interest for knowledge discovery in the Web fostered not least by WEBKDD
itself has led to solutions for many problems in the Web's p- mature era. In the meanwhile
the Web has stepped into a new era where it is experienced as a social medium fostering
interaction among people enabling and promoting the sharing of knowledge experiences and
applications char- terized by group activities community formation and evolution. The design
of Web 2. 0 re?ects the socialcharacterof the Web bringing new potential and new challenges.
The 9th WEBKDD was devoted to the challenges and opportunities of mining for the social Web and
promptly gave rise to the joint event with the First Workshop on Social Network Analysis
(SNA-KDD). Social network research has advanced signi?cantly in the last few years strongly
motivated by the prevalence of online social websites and a variety of large-scale o?ine social
network systems.
