Most often, I see Kaplan and Haenlein's (2010) definition of social media cited in research articles: “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” (p. 61).

With respect to social presence and media richness, applications such as collaborative projects (e.g., Wikipedia) and blogs score lowest, as they are often text-based and hence only allow for a relatively simple exchange. On the next level are content communities (e.g., YouTube) and social networking sites (e.g., Facebook) which, in addition to text-based communication, enable the sharing of pictures, videos, and other forms of media. On the highest level are virtual game and social worlds (e.g., World of Warcraft, Second Life), which try to replicate all dimensions of face-to-face interac- tions in a virtual environment” (p. 63).

Recently, Carr and Hayes (2015)  published a rather interesting article defining social media in such a way it would stick until 2035:)

Carr, C.T. & Hayes, R.A. (2015). Social Media: Defining, Developing, and Divining, Atlantic Journal of Communication, 23:1, 46-65, DOI: 10.1080/15456870.2015.972282 

The definition: "Social media are Internet-based channels that allow users to opportunistically interact and selectively self-present, either in real-time or asynchronously, with both broad and narrow audiences who derive value from user-generated content and the perception of interaction with others” (p. 50).

Social Medium

Social network sites (e.g., Facebook, QQ, GoogleC, YouTube, Yelp, Pheed) 
􏰀  Professional network sites (e.g., LinkedIn, IBM’s Beehive) 
􏰀  Chatboards & discussion for a 􏰀  Social/Casual games (e.g., Farmville) 
􏰀  Wiki “Talk” pages 
􏰀  Tinder 
􏰀  Instagram 
􏰀  Wanelo 
􏰀  Yik Yak 
\

Not a Social Medium

􏰀 Online news services (e.g., NYT online, PerezHilton.com) 􏰀 Wikipedia 􏰀 Skype
􏰀 Netflix
􏰀 E-mail 􏰀 Online news 􏰀 SMS/Texts 􏰀 Oovoo 
􏰀 Tumblr 􏰀 Whisper

 I was surprised to see Tumblr on the list of “not a social media”. Should blogs not be included?

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