D. E. Alexander, Social Media in Disaster Risk Reduction and Crisis Management, Science and Engineering Ethics, vol.20, issue.3, pp.717-733, 2014.

B. W. Blanchard, Guide to emergency management and related terms, definitions, concepts, acronyms, organizations, programs, guidance, executive orders & legislation, 1366.

Y. Cao, A. Nijholt, M. Theune, . Sluis, I. Van-der et al., Modality planning for preventing tunnel vision in crisis management. The Society for the Study of Artificial Intelligence and Simulation of Behaviour, 2008.

, WiPe Paper -Community Engagement & Healthcare Systems Proceedings of the 16th ISCRAM Conference -València, 2019.

R. A. Cnaan, F. Handy, W. , and M. , Defining Who Is a Volunteer: Conceptual and Empirical Considerations, Nonprofit and Voluntary Sector Quarterly, vol.25, p.364, 1996.

A. Cottrell, Research Report: a survey of spontaneous volunteers, 2010.

K. Crawford and M. Finn, The limits of crisis data: analytical and ethical challenges of using social and mobile data to understand disasters, GeoJournal, vol.80, issue.4, pp.491-502, 2015.

T. Daugherty, M. S. Eastin, and L. Bright, Exploring Consumer Motivations for Creating UserGenerated Content, Journal of Interactive Advertising, vol.8, issue.2, pp.16-25, 2008.

E. Durkheim, The Division Of Labor In Society, p.462, 1933.

R. R. Dynes, Organized Behavior in Disaster, 1970.

Z. E. Franco, N. Zumel, K. Blau, K. A. Johnson, and L. E. Beutler, Causality, covariates and consensus in ISCRAM research: towards a more robust study design in a transdisciplinary community, International Journal of Emergency Management, vol.5, issue.1, p.100, 2008.

M. F. Goodchild, Citizens as sensors: the world of volunteered geography, GeoJournal, vol.69, issue.4, pp.211-221, 2007.

T. J. Grant, F. L. Geugies, and P. A. Jongejan, Social Media in Command & Control: A proof-ofprinciple experiment, Proceedings of the 10th International Conference on Information Systems for Crisis Response And Management, p.10, 2013.

E. A. Heide, Convergence behavior in disasters, Annals of Emergency Medicine, vol.41, issue.4, pp.463-466, 2003.

F. E. Horita, L. Degrossi, L. F. Assis, . De, A. Zipf et al., The use of Volunteered Geographic Information (VGI) and Crowdsourcing in Disaster Management: a Systematic Literature Review, AMCIS 2013 Proceedings, 2013.

J. H. Kietzmann, K. Hermkens, I. P. Mccarthy, and B. S. Silvestre, Social media? Get serious! Understanding the functional building blocks of social media, Business Horizons, vol.54, issue.3, pp.241-251, 2011.

P. Koob and E. Australia, Australian emergency management glossary, Emergency Management Australia, 1998.

M. Mathioudakis and N. Koudas, TwitterMonitor: trend detection over the twitter stream, Proceedings of the 2010 international conference on Management of data -SIGMOD '10, p.1155, 2010.

L. Orloff, Managing Spontaneous Community Volunteers in Disasters: a field manual, 2011.

E. L. Quarantelli, Organization under stress, 1966.

C. Reuter, O. Heger, and V. Pipek, Combining Real and Virtual Volunteers through Social Media, Proceedings of the 10th International Conference on Information Systems for Crisis Response And Management, p.11, 2013.

C. Reuter, A. Marx, and V. Pipek, Social Software as an Infrastructure for Crisis Management -a Case Study About Current Practice and Potential Usage, Proceedings of the 8th International Conference on Information Systems for Crisis Response And Management, p.10, 2011.

C. Rizza and Â. G. Pereira, Building a resilient community through social network: ethical considerations about the 2011 Genoa floods, Proceedings of the 11th International Conference on Information Systems for Crisis Response And Management, vol.6, 2014.

J. M. Schraagen and J. G. Van-de-ven, Improving Decision Making in Crisis Response Through Critical Thinking Support, Journal of Cognitive Engineering and Decision Making, vol.2, issue.4, pp.311-327, 2008.

L. Shaskolsky, Volunteerism in disaster situations, p.43, 1965.

M. Snyder and A. M. Omoto, Volunteerism: Social Issues Perspectives and Social Policy Implications, Social Issues and Policy Review, vol.2, issue.1, pp.1-36, 2008.

R. A. Stallings and E. L. Quarantelli, Emergent Citizen Groups and Emergency Management, Public Administration Review, vol.45, p.93, 1985.

J. Sutton, L. Palen, and I. Shklovski, Backchannels on the Front Lines: Emergent Uses of Social Media in the 2007 Southern California Wildfires, Proceedings of the 5th International Conference on Information Systems for Crisis Response And Management, p.9, 2008.

L. Svedin, State of the World's Volunteerism Report 2011: Universal Values for Global Well-being, IAP. United Nations, and EBSCOhost, 2011.

S. Vieweg, A. L. Hughes, K. Starbird, and L. Palen, volunteer | Origin and meaning of volunteer by Online Etymology Dictionary, Proceedings of the 28th international conference on Human factors in computing systems -CHI '10, 1079, 2010.

J. Whittaker, B. Mclennan, and J. Handmer, A review of informal volunteerism in emergencies and WiPe Paper -Community Engagement & Healthcare Systems Proceedings of the 16th ISCRAM Conference -València, 2015.

, disasters: Definition, opportunities and challenges, International Journal of Disaster Risk Reduction, vol.13, pp.358-368

J. Wilson, Volunteering, Annual Review of Sociology, vol.26, issue.1, pp.215-240, 2000.

R. P. Wolensky, Toward a Broader Conceptualization of Volunteerism in Disaster, Journal of Voluntary Action Research, vol.8, issue.3-4, pp.33-42, 1979.

V. Zettl, C. Kotthaus, T. Ludwig, and S. Skudelny, Embedding Unaffiliated Volunteers in Crisis Management Systems: Deploying and Supporting the Concept of Intermediary Organizations, Proceedings of the 14th International Conference on Information Systems for Crisis Response And Management, p.11, 2017.

M. Zook, M. Graham, T. Shelton, and S. Gorman, Volunteered Geographic Information and Crowdsourcing Disaster Relief: A Case Study of the Haitian Earthquake, World Medical & Health Policy, vol.2, issue.2, pp.7-33, 2010.