And, in a way, you talk about media as the "mainstream media" or any other media with a wider audience (and sometimes bigger funding).
Social network could be a simpler network, made up by a set of members (actors in network-speak) and a set of dyadic (at micro-level) ties between them.
In other words, in a social network, it is supposed to be smaller circle of people with interests in common, generally meaning it´s needed interaction/cooperation, since it´s a kind of a peer network.http://en.wikipedia.org/wiki/Social_networkhttp://en.wikipedia.org/wiki/Dyad_(sociology
This doesn´t mean that sometimes the two expressions don´t have the same sense, it seems like there´s some intersection of the senses. But basically, it´s like the above explanation, to me
. But then, it´s a layman´s perspective.
For example, when you are on Facebook communicating with your circle of friends (invited and accepted ones) you are taking advantage of the social network. When the local newspaper, radio, (news) blog, etc, is on Facebook, it´s a kind of social media (to my thinking, I must say).