• Social media are treated as socio-technical infrastructures that shape discourse, attention, and public spheres, not neutral channels; platform logics and connective media govern participation and authority [4], [11], [12], [8].

• Online mobilization patterns show how digital networks translate into offline action, with Twitter, Facebook, and micro-blogging steering protests in Libya, Guatemala, and Korea [6], [3], [14], [9].

• Demographic and life-stage contexts condition digital political engagement, with adolescence, aging, and civil society discourse shaping how online activity translates to political interest and offline participation [5], [18], [17], [19], [15].

• Live information flows, monitoring of debates, and campaign messaging through Twitter and micro-blogging shape audience engagement and political knowledge [2], [20], [13], [9].

• Normative debates on whether the internet enhances the public sphere and democratic deliberation across cultures, including US–Germany comparisons and connectivity across platforms [12], [11], [8], [17].