Becoming Wikipedian: transformation of participation in a collaborative online encyclopedia
GROUP '05 Proceedings of the 2005 international ACM SIGGROUP conference on Supporting group work
Connected Giving: Ordinary People Coordinating Disaster Relief on the Internet
HICSS '07 Proceedings of the 40th Annual Hawaii International Conference on System Sciences
Five deep questions in computing
Communications of the ACM - 50th anniversary issue: 1958 - 2008
Crowdsourcing user studies with Mechanical Turk
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Getting Started with Arduino
Crowdsourcing and all-pay auctions
Proceedings of the 10th ACM conference on Electronic commerce
The role of game theory in human computation systems
Proceedings of the ACM SIGKDD Workshop on Human Computation
On formal models for social verification
Proceedings of the ACM SIGKDD Workshop on Human Computation
Financial incentives and the "performance of crowds"
Proceedings of the ACM SIGKDD Workshop on Human Computation
txteagle: Mobile Crowdsourcing
IDGD '09 Proceedings of the 3rd International Conference on Internationalization, Design and Global Development: Held as Part of HCI International 2009
PhotoSlap: a multi-player online game for semantic annotation
AAAI'07 Proceedings of the 22nd national conference on Artificial intelligence - Volume 2
Experiences of participatory sensing in the wild
Proceedings of the 11th international conference on Ubiquitous computing
mCrowd: a platform for mobile crowdsourcing
Proceedings of the 7th ACM Conference on Embedded Networked Sensor Systems
CAPTCHA: using hard AI problems for security
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
The labor economics of paid crowdsourcing
Proceedings of the 11th ACM conference on Electronic commerce
Examining micro-payments for participatory sensing data collections
Proceedings of the 12th ACM international conference on Ubiquitous computing
Social navigation for the spoken web
Proceedings of the fourth ACM conference on Recommender systems
Complex networks: an engineering view
IEEE Circuits and Systems Magazine - Special issue on complex networks applications in circuits and systems
Analyzing the Amazon Mechanical Turk marketplace
XRDS: Crossroads, The ACM Magazine for Students - Comp-YOU-Ter
A crowdsourcing based mobile image translation and knowledge sharing service
Proceedings of the 9th International Conference on Mobile and Ubiquitous Multimedia
Mobile phones for health education in the developing world: SMS as a user interface
Proceedings of the First ACM Symposium on Computing for Development
ICWE'10 Proceedings of the 10th international conference on Current trends in web engineering
Turkalytics: analytics for human computation
Proceedings of the 20th international conference on World wide web
Human computation: a survey and taxonomy of a growing field
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Field trial of Tiramisu: crowd-sourcing bus arrival times to spur co-design
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Creek watch: pairing usefulness and usability for successful citizen science
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
A game-theoretic analysis of rank-order mechanisms for user-generated content
Proceedings of the 12th ACM conference on Electronic commerce
Emerging theories and models of human computation systems: a brief survey
Proceedings of the 2nd international workshop on Ubiquitous crowdsouring
Quality control for real-time ubiquitous crowdsourcing
Proceedings of the 2nd international workshop on Ubiquitous crowdsouring
VGI as a dynamically updating data source in location-based services in urban environments
Proceedings of the 2nd international workshop on Ubiquitous crowdsouring
Beyond mobile collaboration: toward metropolitan-scale geocentric crowdsourcing
Proceedings of the 2nd international workshop on Ubiquitous crowdsouring
App.locky: users' context collecting platform for context-aware application recommendation
Proceedings of the 2nd international workshop on Ubiquitous crowdsouring
Managing Enterprise IT Systems Using Online Communities
SCC '11 Proceedings of the 2011 IEEE International Conference on Services Computing
Service for crowd-driven gathering of non-discoverable knowledge
ICSOC'11 Proceedings of the 2011 international conference on Service-Oriented Computing
An agent based model for evacuation traffic management
Proceedings of the Winter Simulation Conference
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Crowdsourcing systems aim to solve complex tasks by engaging a multitude of humans through mobile and social media and by harnessing their ability to perform specific subtasks and to report the results. Given the rapid increase in the number, size and diversity of ubiquitous crowdsourcing applications across a wide spectrum of domains all around the world, there is a need for a principled way of conceptualising such systems. The first step is the development of a crowdsourcing typology to create a baseline for comparing, evaluating and advancing efforts in this field. For example, crowdsourcing systems need to address a common set of issues to ensure their effectiveness, such as quality control and incentive design. In this paper, we present a thematic overview of the emerging ubiquitous crowdsourcing systems by grouping them based on the task complexity that they support and along key challenges in successfully harvesting expertise of large human networks.