Social Media and Dentistry

We all know what dentistry is.  But what is or is it, are, social media?  Social is defined as:  of or relating to human society and its modes of organization.  Media is defined as the means of communication, as radio and television, newspapers, 
and magazines, that reach or influence people widely.  
Taken together, social media, according to Wikipedia, means a term used to describe the type of media that is based on conversation and interaction between people online.  It can be mistaken for social networking.  Lori Cohen casts the distinction well as follows.

Social Media can be called a strategy and an outlet for broadcasting, while Social Networking is a tool and a utility for connecting with others. 

The difference is not just semantics but in the features and functions put into these websites by their creators which dictates the way they are to be used. There’s also a kind of, which came first, the chicken or the egg kind of argument to be made here. I suspect that Social Networking came first which evolved into Social Media."