This chapter aims to empirically investigate the connection between offline political civic engagement and a specific form of political engagement carried out in the online environment, namely online political expression, in the context of the 2013 Czech Parliamentary Election. It contributes to the research territory by using empirical data from the Czech Republic, a country where social media have only very recently started playing a more significant role in political communication. The chapter analyzes the responsiveness of the Czech citizens to the electoral mobilization via social network sites by parties and candidates, and examines the intensity of political use of social media by the Czech online population. Denouncing social media activism as 'clicktivism' or 'slacktivism', the critics have alleged that there is a profound gap between peoples' actions in the online and in the offline world and that engaging in this form of participation might even lead to increasing passivity in relation to offline politics.