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Twitter and facebook are knowen to make debates more [[homophily|homophilies]]<ref>Himelboim, I., McCreery, S., & Smith, M. (2013). Birds of a Feather Tweet Together: Integrating Network and Content Analyses to Examine Cross-Ideology Exposure on Twitter. Journal of Computer-Mediated Communication, 18(2), 40–60.</ref>. This a represntation of debate about the israeli(blue)-Palestinian (green) conflict in Gaza in 2014.
[[File:Gaza-Israel-Palestin-2014.png|400px|right|thumb|Produced by [http://giladlotan.com/ Gilad Lotan] - [http://www.vox.com/2014/8/7/5971759/chart-israel-palestine-polarized-twitter?utm_medium=social&utm_source=twitter&utm_campaign=voxdotcom&utm_content=thursday source: Vox] ]]
Homophily, or the idea of "birds of a feather flock together", [30] is a fundamental and pervasive phenomenon in social networks, and refers to the tendency of individuals to form relationships with others that have similar attributes, behaviors or opinions. Homophily commonly occurs in empirical network data, and has been extensively studied as a sociological phenomenon. McPherson and Smith
[37] provide an in depth review of homophily literature. The emergence of homophily during network formation has be explained using agent based models,and in economics [14] by incorporating chance, choice, and tie formation costs.