2 The concept of the “long tail” describes a distribution where a few mega-sellers or hubs have a lot of usage whereas specialized content has only very few buyers or users. Since there is a very huge number of special items a graph of this distribution shows a “long tail”. See e.g. https://en.wikipedia.org/wiki/Long_tail .
3 Compare EEXCESS Vision: http://eexcess.eu/vision/ .
4 On the recommendation process see Borst and Witt (2016). On context detection of the users and their circumstances see Schlötterer, Seifert, Lutz and Granitzer (2015).
5 Wikipedia Reference Butler: http://eexcess.eu/wikipedia-reference-butler/ .
6 All prototypes and visualizations can be found at http://eexcess.eu/results/ .
7 Wikipedia was used because a number of surveys have shown that it is very often the most important source for starting research on a new topic even in academic contexts. Also, the structure with individual paragraphs and headlines supports the automatic detection of section topics.
8 Details on the requirements can be found at http://eexcess.eu/content-providers/ .
9 All project deliverables are made available to the public on the eexcess website. They can be found on the project website from September 2016: http://eexcess.eu/publications.
10 Information on how to become a content provider can be found at http://eexcess.eu/content-providers/.