Interesting. I usually see social networking defined as a subset of social media. The definition of a social network site that’s usually referenced is from danah boyd and Nicole Ellison’s 2007 paper on Social Network Sites: Definition, History, and Scholarship:
We define social network sites as web-based services that allow individuals to (1) construct a public or semi-public profile within a bounded system, (2) articulate a list of other users with whom they share a connection, and (3) view and traverse their list of connections and those made by others within the system. The nature and nomenclature of these connections may vary from site to site.
By this definition, email, blogs without blogrolls, Signal (where I can’t view or traverse others lists of connections) are all examples of social media, but not social network sites.
boyd and ellison also talk about the rise of social network sites, including noting that several well-known examples started as non-networked social media:
From 2003 onward, many new SNSs were launched, prompting social software analyst Clay Shirky (2003) to coin the term YASNS: “Yet Another Social Networking Service.” Most took the form of profile-centric sites, trying to replicate the early success of Friendster or target specific demographics… Furthermore, as the social media and user-generated content phenomena grew, websites focused on media sharing began implementing SNS features and becoming SNSs themselves. Examples include Flickr (photo sharing), Last.FM (music listening habits), and YouTube (video sharing).