Leveraging Users’ Trust and Reputation in Social Networks Ureña, Raquel Chiclana Parrilla, Francisco Carrasco, Ramón Alberto Herrera Viedma, Enrique In on line communities, where there is a huge number of users that interact under anonymous identities, it has been observed that e-word of mouth is a very powerful influence tool. So far, this technology is well known in on-line marketplaces, such as Amazon, eBay or travel based platforms like Tripadvisor or Booking. However, these trust based approach can be leverage in other scenarios from e-democracy to trust based recommendations on e-health context and e-learning systems. The purpose of this contribution is to analyse the main existing trust and reputation mechanisms and to point out new research challenges that needs to be accomplished with the objective of fully exploiting these systems in real world on-line communities. 2020-03-11T09:43:53Z 2020-03-11T09:43:53Z 2020 journal article Ureña, R., Chiclana, F., Carrasco, R. A., & Herrera-Viedma, E. (2019). Leveraging Users’ Trust and Reputation in Social Networks. Procedia Computer Science, 162, 955-962. http://hdl.handle.net/10481/60205 10.1016/j.procs.2019.12.073 eng http://creativecommons.org/licenses/by-nc-nd/3.0/es/ open access Atribución-NoComercial-SinDerivadas 3.0 España Elsevier BV