This is something which really caught my attention! Definitely something worth considering while designing functionality for social media websites.

Kietzmann.J,Hermkens.,K.,McCarthy.,I.,Silvestre.,B.2011.Social media? Get serious! Understanding the functional building blocks of social media. Avaliable from: http://www.sciencedirect.com/science/article/pii/S0007681311000061[Accessed on 22nd april 2015]