TY - JOUR A2 - Alhajj, Reda AU - Zygmunt, Anna AU - Gliwa, Bogdan PY - 2015 DA - 2015/06/16 TI - The Comparison of Users Activity on the Example of Polish and American Blogosphere SP - 907547 VL - 2015 AB - Blogs are popular way to express opinions on the Internet. Due to their popularity and their public character blogs attract attention of many researchers. In this paper we compare two national blogospheres (Polish and American) from different angles such as characteristics of messages and interactions, structure of social groups, topics discussed in them, and the influence of real-world events on the behavior of such groups. In our approach we try to combine in advanced manner users activity on both the individual and community level. The comparison reveals some differences and various characters of both portals. Methods for analysis of groups dynamics, users roles, and topics in groups are presented. SN - 1058-9244 UR - https://doi.org/10.1155/2015/907547 DO - 10.1155/2015/907547 JF - Scientific Programming PB - Hindawi Publishing Corporation KW - ER -