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The aim of this paper is to review the main questions dealt with by the literature on the effect of Internet on political participation. The paper distinguishes three relevant aspects: the estimation of the impact of Internet on the levels and types of political participation; the analysis of the causal mechanisms that lie behind the relationship between Internet use and participation; and the effect of the Internet on participatory inequalities. We conclude by identifying the aspects on which there is a relative consensus among scholars, the debates surrounding controversial conclusions obtained from different empirical analyses, and those questions where further research seems particularly necessary.

This article examines how traditional and Internet resources are related to three online modes of political participation (contact, donation, petition) in Spain. Using a Heckman selection model, we find that traditional resources are more important in predicting access to the Internet than online participation. Among Internet users, traditional resources are irrelevant for predicting participation, while online resources are important to understanding who participates online. We also find that the effects of resources are not the same for all modes of participation and that some characteristics of the political system may shape the effects of resources on online participation.

Political interest is a potentially important moderator of the relationship between digital media use and traditional forms of political participation. We theorize that the interaction between interest and digital media can be either positive or negative, depending on whether the action is voting, an elite-directed act, or a self-directed act. To test our expectation, we use British Election Studies data from 2001, 2005, and 2010. We find that digital media use is positively and consistently associated with political talk for those lower in political interest. For voting, we find a similar relationship that appears to be strengthening over time. For the elite-directed acts of donating money and working for a party, we find a highly variable moderating effect of political interest that can be positive, negative, or nonexistent.