Results from IEA's International Civic and Citizenship Education Study (ICCS) 2016 show that a notable number of young students use social media to engage with political and social issues regularly. This brief examines how this type of social media use may translate to students' intended political behavior. We find that social media use for engagement with political and social issues among young people is weakly related to intentions to participate in illegal protest activities. However, it is moderately related to feelings of citizenship self-efficacy and intentions to participate in legal forms of activism. We examined these relationships more closely and found that students' increased sense of citizenship self-efficacy partially explains the relationship between social media use for engagement with political and social issues and students' expected participation in legal forms of activism.