2Schmitz P. Inducing Ontology from Flickr Tags[EB]. [2009- 06 - 30 ]. http://www. semanticmetadata. net/hosted/taggingws- www2006 - files/22. pdf.
3Begelman G, et al. Automated Tag Clustering: Improving Search and Exploration in the Tag Space [ EB ]. [ 2009 - 07 - 05 ]. http://www.pui. ch/phred/automated-tag-clustering/autornatedtag-clustering.pdf.
4Peter Mika. Ontologies are Us: A Unified Model of Social Networks and Semantics[ EB]. [ 2009 - 07 - 05 ]. http://www. es. vu. nl/pmika/research/papers/ISWC- folksonomy. pdf.
5Ching - man Au Yeung, et al. Understanding the Semantics of Ambiguous Tags in Folksonomies [ EB ]. [ 2009 - 07 - 07 ]. http://sunsite. informatik. rwth - aachen - WS/Vol- 292/paper11. pdf.
3van Damme C, Hepp M, Siorpaes K. FolksOntology: An Integrated approach for Turning Folksonomies into Ontologies [ EB/OL ]. [ 2007 - 10 - 20 ]. http ://www. heppnetz.de/files/vandammeheppsiorpaes - folksontology - semnet2007 - crc. pdf.
4Specia L, Motta E. Integrating Folksonomies with the Semantic Web [EB/OL]. [2007 - 10 - 12]. http://www.eswc2007.org/pdf/eswe07 - speeia. pdf.
5Al - Khalifa H S, Davis H C. FAsTA : A Folksonomy - Based Automatic Metadata Generator [ EB/OL]. [ 2007 - 10 - 12 ]. http:// eprints.ecs. soton.ac. uk/14186/1/EC - TEL07_v2. pdf.
6Hassan - Montero Y, Herrero - Sdana V. Improving Tag - Clouds as Visual Information Retrieval Interfaces [ EB/OL ]. [ 2007 - 10 - 20 ]. http ://www. nosolousabilidad.com/hassan/improving _ tagclouds.pdf.
7Schmitz C, Grahl M, Hotho A, et al. Network Properties of Folksonomies [ EB/OL ]. [ 2007 - 10 - 12 ]. http ://www2007. org/workshops/paper-13. pdf.
8Begelman G, Keller P, Smadja F. Automated Tag Clustering:Improving Search and Exploration in the Tag Space [ EB/OL ]. [ 2007 - 10- 20 ]. http ://www. pui. ch/phred/automated_tag_clustering/ automated_tagclustering. pdf.
9Newman M E J, Girvan M. Finding and Evaluating Community Structure in Networks [ J ]. Physical Review E, 2004,69 (2).
4Alani H, Kim S, Millard D, et al. Automatic ontology based knowledge extraction from Web documents [J]. Intelligent Systems, 2003, 18(1): 14 -21.
5Dill S, Tomlin J. SemTag and seeker: bootstrapping the semantic Web via automated semantic annotation[C]//Proc of the 12th Int'l conf on World Wide Web. New York.. ACM, 2003: 178-186.
7Ehrig M, Staab S. QOM quick omology mapping[C]// Proceedings of the 3rd International Conference on Semantic Web (ISWC). Hiroshima: Springer, 2004:683- 697.
8Fu F, Liu L H. Empirical analysis of online social net-works in the age of Web 2. 0[ J]. PHYSICA. Section A,2008,387:675-684.
9Nadim 0,Asma M. Towards a Formal Model of KnowledgeSharing in Complex Systems[ J]. Smart Information andKnowledge M anagement ,2010,260:53-82.