Self-similarity in World Wide Web traffic: evidence and possible causes
Proceedings of the 1996 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
Mining knowledge-sharing sites for viral marketing
Proceedings of the eighth ACM SIGKDD international conference on Knowledge discovery and data mining
On the bursty evolution of blogspace
WWW '03 Proceedings of the 12th international conference on World Wide Web
Data Mining Meets Performance Evaluation: Fast Algorithms for Modeling Bursty Traffic
ICDE '02 Proceedings of the 18th International Conference on Data Engineering
Maximizing the spread of influence through a social network
Proceedings of the ninth ACM SIGKDD international conference on Knowledge discovery and data mining
Information diffusion through blogspace
Proceedings of the 13th international conference on World Wide Web
Tracking Information Epidemics in Blogspace
WI '05 Proceedings of the 2005 IEEE/WIC/ACM International Conference on Web Intelligence
The political blogosphere and the 2004 U.S. election: divided they blog
Proceedings of the 3rd international workshop on Link discovery
The dynamics of viral marketing
EC '06 Proceedings of the 7th ACM conference on Electronic commerce
Understanding churn in peer-to-peer networks
Proceedings of the 6th ACM SIGCOMM conference on Internet measurement
Measurements, analysis, and modeling of BitTorrent-like systems
IMC '05 Proceedings of the 5th ACM SIGCOMM conference on Internet Measurement
Understanding Instant Messaging Traffic Characteristics
ICDCS '07 Proceedings of the 27th International Conference on Distributed Computing Systems
Statistical properties of community structure in large social and information networks
Proceedings of the 17th international conference on World Wide Web
Planetary-scale views on a large instant-messaging network
Proceedings of the 17th international conference on World Wide Web
Poking facebook: characterization of osn applications
Proceedings of the first workshop on Online social networks
The stretched exponential distribution of internet media access patterns
Proceedings of the twenty-seventh ACM symposium on Principles of distributed computing
Microscopic evolution of social networks
Proceedings of the 14th ACM SIGKDD international conference on Knowledge discovery and data mining
Mobile call graphs: beyond power-law and lognormal distributions
Proceedings of the 14th ACM SIGKDD international conference on Knowledge discovery and data mining
Characterizing user behavior in online social networks
Proceedings of the 9th ACM SIGCOMM conference on Internet measurement conference
Social action tracking via noise tolerant time-varying factor graphs
Proceedings of the 16th ACM SIGKDD international conference on Knowledge discovery and data mining
Learning a user-thread alignment manifold for thread recommendation in online forum
CIKM '10 Proceedings of the 19th ACM international conference on Information and knowledge management
Modeling the temporal evolution of an online cancer forum
Proceedings of the 1st ACM International Health Informatics Symposium
Measurement and gender-specific analysis of user publishing characteristics on myspace
IEEE Network: The Magazine of Global Internetworking
Measuring message propagation and social influence on Twitter.com
SocInfo'10 Proceedings of the Second international conference on Social informatics
A framework for quantitative analysis of cascades on networks
Proceedings of the fourth ACM international conference on Web search and data mining
EPSP: Enhancing Network Protocol with Social-Aware Plane
GREENCOM-CPSCOM '10 Proceedings of the 2010 IEEE/ACM Int'l Conference on Green Computing and Communications & Int'l Conference on Cyber, Physical and Social Computing
Malware propagation in online social networks: nature, dynamics, and defense implications
Proceedings of the 6th ACM Symposium on Information, Computer and Communications Security
Modeling answerer behavior in collaborative question answering systems
ECIR'11 Proceedings of the 33rd European conference on Advances in information retrieval
Prefetching strategy in peer-assisted social video streaming
MM '11 Proceedings of the 19th ACM international conference on Multimedia
What's in a hashtag?: content based prediction of the spread of ideas in microblogging communities
Proceedings of the fifth ACM international conference on Web search and data mining
Characterizing user navigation and interactions in online social networks
Information Sciences: an International Journal
User generated content consumption and social networking in knowledge-sharing OSNs
SBP'10 Proceedings of the Third international conference on Social Computing, Behavioral Modeling, and Prediction
Propagation of question waves by means of trust in a social network
FQAS'11 Proceedings of the 9th international conference on Flexible Query Answering Systems
Modeling user posting behavior on social media
SIGIR '12 Proceedings of the 35th international ACM SIGIR conference on Research and development in information retrieval
Workload Characterization and Performance Implications of Large-Scale Blog Servers
ACM Transactions on the Web (TWEB)
Multi-scale dynamics in a massive online social network
Proceedings of the 2012 ACM conference on Internet measurement conference
Cloud-based social application deployment using local processing and global distribution
Proceedings of the 8th international conference on Emerging networking experiments and technologies
The multidimensional study of viral campaigns as branching processes
SocInfo'12 Proceedings of the 4th international conference on Social Informatics
Contributor profiles, their dynamics, and their importance in five q&a sites
Proceedings of the 2013 conference on Computer supported cooperative work
Identifying same wavelength groups from twitter: a sentiment based approach
ACIIDS'13 Proceedings of the 5th Asian conference on Intelligent Information and Database Systems - Volume Part II
Measuring message propagation and social influence on Twitter.com
International Journal of Communication Networks and Distributed Systems
SatTorrent: satellite-aided P2P content distribution for virtual environments
Proceedings of the 6th International ICST Conference on Simulation Tools and Techniques
Survey of social search from the perspectives of the village paradigm and online social networks
Journal of Information Science
Question Waves: A multicast query routing algorithm for social search
Information Sciences: an International Journal
The Scope for online social network aided caching in web CDNs
ANCS '13 Proceedings of the ninth ACM/IEEE symposium on Architectures for networking and communications systems
Misleading Generalized Itemset discovery
Expert Systems with Applications: An International Journal
Discovering content-based behavioral roles in social networks
Decision Support Systems
Discovering generalized association rules from Twitter
Intelligent Data Analysis
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Various online social networks (OSNs) have been developed rapidly on the Internet. Researchers have analyzed different properties of such OSNs, mainly focusing on the formation and evolution of the networks as well as the information propagation over the networks. In knowledge-sharing OSNs, such as blogs and question answering systems, issues on how users participate in the network and how users "generate/contribute" knowledge are vital to the sustained and healthy growth of the networks. However, related discussions have not been reported in the research literature. In this work, we empirically study workloads from three popular knowledge-sharing OSNs, including a blog system, a social bookmark sharing network, and a question answering social network to examine these properties. Our analysis consistently shows that (1) users' posting behavior in these networks exhibits strong daily and weekly patterns, but the user active time in these OSNs does not follow exponential distributions; (2) the user posting behavior in these OSNs follows stretched exponential distributions instead of power-law distributions, indicating the influence of a small number of core users cannot dominate the network; (3) the distributions of user contributions on high-quality and effort-consuming contents in these OSNs have smaller stretch factors for the stretched exponential distribution. Our study provides insights into user activity patterns and lays out an analytical foundation for further understanding various properties of these OSNs.