Among the activities that people participate in on the Social
Web are argumentative discussions and decision making. This paper
analyzes a series of use-cases (from the perspective of social media sites)
that share the presence of such argumentative discussions and where
the structure of online discussions can be represented in SIOC. Our goal
is to externalize implicit argumentation structures hidden in the usergenerated
content. For capturing it and making it explicit, we propose a
SIOC Argumentation ontology module as a formal representation.