This is a collection of work that is grounded on the assumption that there are meaningful relationships to be found in coincidence. Recent debates about our increasingly selective view to information - a result of content personalisation in search results and social network timelines due to the commercial interest of the social network providers - are a strong motivation for this kind of data analyses and information retrieval systems, which aim at avoiding the amplification of some biases that lie in digital social structures (e.g. gender imbalances but also deliberate spread of misinformation).