  Understanding fluctuation of users help stakeholders to provide a better
support to communities. Below we present an experiment where we detect
communities, their evolution and based on the data characterize users that
stay, leave or join a community. Using a resulted feature set and logistic
regression we operate with models of users that are joining and users that are
staying in a community. In the related work we emphasize a number of features
we will include in our future experiments to enhance train accuracy. This work
represents a first from a series of experiments devoted to user fluctuation in
communities.
