The idea is to summarize the users' check-in spots sharing high-level information (e.g. categories). For example, both "Starbucks" and "Coffee World" are in relation to "Cafe" category. We adopt a three-level hierarchical structure of predefmed categories for venues available in Foursquare database [7]. The bottom level categories assign specific information for venues whilst the upper level categories describe more general information. Figure 3 gives a part of the hieratical structure of categories. In this work, we use only ten top level categories, shown in Table 2, to describe a user interests.