This chapter examines the extent to which digital technologies can threaten democracy by creating “information cocoons,” within which information is filtered and tailored to our tastes and prevailing opinions. Digital technologies allow us to filter information and contacts in a very efficient way, thereby creating a risk that we end up exchanging information only with like-minded people. Since humans' bounded rationality cannot cope with the amount of information available on the Internet, we are confronted with problems of cognitive dissonance that we attempt to solve by ignoring opinions and arguments that differ too much from our own. Recent political events in the Arab world suggest that digital technologies support democratisation. But there is also a risk that these technologies might impoverish democratic debates and reduce exchanges amongst the stakeholders of a given political arena while radicalising their points of views. This threat is serious and needs to be investigated. To do so, this chapter suggests a methodology to evaluate that risk, as well as ways to mitigate it. Various methods have been used to analyse the polarisation of opinions in human societies, such as the ones analysing the traces left by Internet users in blogs or hypertext links. The authors provide a review of these methods after having explained the main factor conducive to the creation of information closure.
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