@incollection{Rau2013,
  author    = {Harald Rau},
  title     = {Social Networks: The Question on Efficiency Remains},
  booktitle = {Handbook of Social Media Management},
  edition   = {1. Auflage},
  series    = {Value Chain and Business Models in Changing Media Markets},
  editor    = {Mike Friedrichsen and Wolfgang M{\"u}hl-Benninghaus},
  isbn      = {978-3-642-28896-8},
  url       = {https://link.springer.com/book/10.1007/978-3-642-28897-5?page=1\#toc},
  year      = {2013},
}