@incollection{Rau2013,
  author    = {Rau, Harald},
  title     = {Social Networks: The Question on Efficiency Remains},
  booktitle = {Handbook of Social Media Management},
  editor    = {Friedrichsen, Mike and M{\"u}hl-Benninghaus, Wolfgang},
  edition   = {1. Auflage},
  isbn      = {978-3-642-28896-8},
  url       = {https://link.springer.com/book/10.1007/978-3-642-28897-5?page=1\#toc},
  institution = {Verkehr-Sport-Tourismus-Medien},
  pages     = {689 -- 701},
  year      = {2013},
  abstract  = {kein Abstract vorhanden},
  language  = {en}
}