How do you define "social media" ?
Is youTube social media?
What about bugguide.net?
Is LinkedIN?
Minecraft?
Email?
I do think a definition is possible. Social media are online applications that allow social interactions in a mix of public, and/or private groups and networks.
Email is not social media (though usenet might be)
Bugguide and minecraft have social media functions but are not primarily social applications.
LinkedIN is a cancer.
I'm not sure a workable definition of "social media" is actually possible. The one you give, which is better than most I've seen, is still arguably stretchable to cover voice phone calls that happen to be carried over IP networks.
#VOIP#IP #data #network #SocialMedia #voice #phone #phonecall