  We introduce VEXUS, an interactive visualization framework for exploring user
data to fulfill tasks such as finding a set of experts, forming discussion
groups and analyzing collective behaviors. User data is characterized by a
combination of demographics like age and occupation, and actions such as rating
a movie, writing a paper, following a medical treatment or buying groceries.
The ubiquity of user data requires tools that help explorers, be they
specialists or novice users, acquire new insights. VEXUS lets explorers
interact with user data via visual primitives and builds an exploration profile
to recommend the next exploration steps. VEXUS combines state-of-the-art
visualization techniques with appropriate indexing of user data to provide fast
and relevant exploration.
