One of digital native’s fav sites, Wikipedia defines it:
Social media includes web- and mobile-based technologies which are used to turn communication into interactive dialogue among organizations, communities, and individuals.
A more scholarly definition of social media comes from Andreas M. Kaplan and Michael Haenlein in an article titled, “Users of the world, unite! The challenges and opportunities of Social Media”:
Social media is a group of Internet-based applications that build on the ideological and technological foundations of Web 2.0, and that allow the creation and exchange of user generated content.
Despite their similarities, it is clear that social media is all about interactivity, shared content and dialogue.